IFR Cross-Country Flight Planning Guide — Complete Checklist

IFR flight planning begins well before you arrive at the airport. Under 14 CFR 91.103, pilots are required to become familiar with all available information concerning a flight. For IFR operations, this obligation is even more critical because you will be operating in conditions where your margin for error is significantly reduced.

The following checklist covers every element you need to address before filing your IFR flight plan. Complete each item methodically. Rushing through pre-flight planning is one of the most common mistakes instrument pilots make, and it is often the root cause of incidents that could have been prevented.

IFR route planning is fundamentally different from VFR route planning. Instead of drawing a line on a sectional chart, you are building a route through the structured airway system that ATC can manage efficiently. Your route must account for minimum en route altitudes, obstacle clearance, airspace restrictions, and traffic flow.

Victor Airways (Low Altitude)

Victor airways (designated with a V prefix, such as V235) are the low-altitude airway structure from 1,200 feet AGL up to but not including 18,000 feet MSL. They are defined by VOR radials and intersections. Each airway segment has a published Minimum En Route Altitude (MEA) that guarantees both obstacle clearance (1,000 feet in non-mountainous terrain, 2,000 feet in mountainous terrain) and adequate navigation signal reception.

When planning via Victor airways, pay attention to the MEAs along each segment. If an MEA is higher than your desired cruise altitude, you will need to climb for that segment or find an alternative route. Also check for Minimum Obstruction Clearance Altitudes (MOCAs), which provide obstacle clearance but may not guarantee VOR signal reception beyond 22 NM from the facility.

Jet Routes (High Altitude)

Jet routes (designated with a J prefix, such as J80) operate from 18,000 feet MSL (FL180) to FL450. Above FL180, you are in Class A airspace where IFR flight is mandatory. Jet routes are defined by VOR radials or GPS waypoints. All altitudes on jet routes are flight levels based on the standard altimeter setting of 29.92 inHg.

Direct (GPS) Routing

With an IFR-approved GPS, you can file direct routes between any two waypoints. ATC will often approve direct routing in uncongested airspace. However, in busy terminal areas and along the eastern seaboard, expect to be assigned airways or preferred routes. When filing direct, ensure that your route does not pass through restricted or prohibited airspace without proper authorization.

Even when filing direct, you must verify that your planned altitude provides adequate obstacle clearance along the entire route. The Off-Route Obstacle Clearance Altitude (OROCA) on IFR en route charts shows the maximum terrain and obstacle elevation within each grid square, rounded up to the next 100-foot increment plus a buffer. This is not an assigned altitude but a reference for emergency use.

Preferred Routes

The FAA publishes preferred IFR routes between major city pairs. These routes are designed to manage traffic flow and reduce ATC workload. You can find them in the Airport/Facility Directory (Chart Supplement) or in ForeFlight and other flight planning apps. Filing a preferred route significantly increases the likelihood of receiving your route as filed, which simplifies your planning and reduces readback errors.

SIDs (Standard Instrument Departures)

SIDs are published departure procedures that transition you from the airport environment into the en route airway structure. They are primarily used at busy airports to standardize departure routing and separate departing traffic from arriving traffic. A SID may include altitude restrictions, speed restrictions, and specific turn instructions.

To accept a SID, you must have the departure procedure chart available in the cockpit (paper or electronic) or the procedure loaded in your GPS/FMS. If you cannot accept a SID, file "NO SID" in the remarks section of your flight plan. Be prepared for possible delays, as ATC may need to provide individual vectors instead.

STARs (Standard Terminal Arrival Routes)

STARs are the arrival counterpart to SIDs. They transition you from the en route structure into the terminal area and set you up for an instrument approach. STARs often include altitude restrictions (descend via), speed restrictions (expect 250 knots at FIXXX), and crossing altitude requirements.

When you receive a STAR assignment (either in your initial clearance or from en route ATC), brief the procedure thoroughly. Know the altitude restrictions, expected speeds, and the transition that connects the STAR to your assigned approach. Falling behind the aircraft on a STAR is a common source of errors, especially in high-workload environments.

Weather is the single most important variable in IFR flight planning. Unlike VFR flying where you can see and avoid weather, IFR operations put you directly in the clouds. Understanding what is in those clouds and what conditions await you at your destination separates safe IFR flying from reckless instrument use.

A thorough IFR weather analysis covers current conditions (METARs), forecasts (TAFs), area forecasts, winds aloft, AIRMETs, SIGMETs, PIREPs, and prog charts. Do not rely on a single weather source. Cross-reference multiple products to build a complete picture.

Key Weather Products for IFR Pilots

METARs: Current surface conditions at airports along your route. Pay special attention to ceiling height, visibility, wind direction and speed, temperature/dewpoint spread (fog potential), and any remarks about recent weather or runway conditions.

TAFs: Terminal Area Forecasts cover a 24-30 hour period and are the primary tool for determining whether you need an alternate airport. Understand the TAF time groups: FM (from), TEMPO (temporary fluctuations), PROB (probability), and BECMG (becoming). These nuances matter for the 1-2-3 rule analysis.

AIRMETs: Advisories for moderate icing (Zulu), moderate turbulence (Tango), and IFR conditions/mountain obscuration (Sierra). These cover large geographic areas and are issued every 6 hours with updates as needed. If an AIRMET Zulu covers your route and you are not in a FIKI aircraft, you need an alternative plan.

SIGMETs: Significant meteorological information for severe conditions: severe turbulence, severe icing, volcanic ash, dust storms, and thunderstorms. Convective SIGMETs specifically cover thunderstorm activity. A SIGMET along your route demands careful evaluation and likely a route change or delay.

PIREPs: Pilot Reports are the most valuable real-time weather data available. They tell you what actual pilots are experiencing at specific altitudes and locations. A cluster of moderate icing PIREPs at your planned altitude is far more actionable than a broad AIRMET. Always check PIREPs and contribute your own after every flight.

Winds Aloft: Forecast winds at various altitudes along your route. Critical for fuel planning (headwind vs tailwind), altitude selection, and understanding atmospheric stability. Large wind speed variations between altitudes can indicate wind shear.

Thunderstorms and Convective Weather

Thunderstorms are the most dangerous weather phenomenon for any aircraft, IFR or VFR. A mature thunderstorm cell contains severe turbulence, hail, lightning, microbursts, windshear, and icing. Embedded thunderstorms (hidden within widespread cloud layers) are particularly dangerous for IFR pilots because you cannot see them visually.

Never attempt to penetrate a thunderstorm intentionally. Onboard weather radar and ATC advisories are essential for thunderstorm avoidance. The recommended minimum separation from a known thunderstorm cell is 20 nautical miles. If convective activity is widespread along your route, seriously consider delaying or cancelling the flight. No schedule is worth flying into a thunderstorm.

Turbulence

IFR turbulence comes in several forms: mechanical turbulence (terrain-induced), convective turbulence (thermal activity), frontal turbulence (boundary interactions), and clear air turbulence (CAT, typically at higher altitudes near the jet stream). PIREPs are your best tool for assessing turbulence intensity. Light turbulence is a nuisance; moderate turbulence makes aircraft control difficult; severe turbulence can cause structural damage and loss of control.

When turbulence is reported or forecast along your route, consider alternate altitudes. Often a climb or descent of just 2,000 feet can take you out of the worst turbulence layer. Request ride reports from ATC for other aircraft on your route. If severe turbulence is reported, change your route or delay the flight.

Structural icing is one of the top killers in general aviation IFR flying. Ice accumulation degrades lift, increases drag, increases weight, and can block pitot tubes and static ports. Even light icing over time can degrade aircraft performance to the point where you cannot maintain altitude or airspeed.

Understanding icing types and having a pre-planned escape strategy is not optional for IFR pilots. The time to decide what to do about icing is on the ground during planning, not at 8,000 feet watching ice build on your wings.

Icing Escape Strategies

Before every IFR flight where icing is even remotely possible, determine your escape plan:

• Climb above: If the freezing level is within your aircraft's performance envelope, climbing above the clouds or above the freezing level eliminates the icing threat. Verify you have the performance to climb through the icing layer quickly.
• Descend below: If warmer air exists at lower altitudes and terrain permits, descending below the freezing level or below the cloud bases may resolve icing. Check MEAs before planning a descent escape.
• Reverse course: If icing was not present behind you, a 180-degree turn to exit the icing area is a valid option. Do not press forward hoping it will improve.
• Divert: If no altitude change resolves the icing, divert to the nearest suitable airport. Declare an emergency if ice accumulation is degrading aircraft performance.

The alternate airport requirement is one of the most frequently tested and most commonly misunderstood regulations in instrument flying. Under 14 CFR 91.169, you must file an alternate airport unless the weather at your destination meets specific criteria. Here is how it works:

Selecting an Alternate Airport

When selecting an alternate, consider these factors in order of importance:

1. Weather: The alternate must have forecast weather that meets alternate minimums at your ETA. For a precision approach: 600-foot ceiling and 2 SM visibility. For a non-precision approach: 800-foot ceiling and 2 SM visibility.
2. Approach availability: Ideally select an alternate with a precision approach (ILS or LPV) and verify that the approach is operational (check NOTAMs for navaid outages).
3. Fuel range: You must be able to reach the alternate from your destination with adequate fuel remaining. The alternate should not be so far away that reaching it becomes marginal.
4. Services: Consider whether the alternate has fuel, maintenance, rental cars, and other services you might need if you divert.
5. Different weather system: When possible, select an alternate that is in a different weather system from your destination. If your destination is socked in by a warm front, an alternate 20 miles away will likely be socked in too.

Non-Standard Alternate Minimums

Some airports have non-standard alternate minimums, indicated by a triangle with an "A" symbol on the approach plate. These airports may require higher minimums than the standard 600-2 or 800-2, or they may prohibit use as an alternate entirely (marked "NA" for alternate). Always check the alternate minimums section when selecting an unfamiliar airport as your alternate.

Common 1-2-3 Rule Mistakes

• Using current METARs instead of forecast TAFs for the 1-2-3 rule analysis. The rule is based on the forecast, not current conditions.
• Forgetting that TEMPO groups in the TAF count. If the TAF shows TEMPO conditions below 2,000/3 during the window, you need an alternate.
• Selecting an alternate that is too close to the destination and likely affected by the same weather system.
• Not checking alternate minimums for the alternate airport. The standard 600-2 / 800-2 only applies if the airport does not have non-standard alternate minimums published.
• Assuming that not needing an alternate means the weather will be good. The 1-2-3 rule is a legal minimum, not a safety guarantee.

Fuel exhaustion and fuel starvation remain leading causes of general aviation accidents. In IFR operations, the stakes are even higher because diverting to an unplanned airport requires an approach, and approaches take time and fuel. The regulatory requirement under 14 CFR 91.167 is straightforward: you must carry enough fuel to fly to your destination, then to your alternate (if required), then fly for 45 minutes at normal cruise speed.

However, the regulation is a bare minimum. Experienced IFR pilots plan for more contingencies than the regulation requires. Holding patterns, vectors for sequencing, unexpected weather deviations, and missed approaches all burn fuel that is not in your original plan.

Fuel Planning Best Practices

• Always use actual winds aloft for cruise fuel calculations, not standard no-wind figures. A 30-knot headwind can increase your fuel burn by 20% or more on a long leg.
• Add a contingency factor of 10-15% above your calculated fuel requirement. This covers taxi delays, vectors for sequencing, and minor routing changes.
• Know your aircraft's actual fuel burn rate, not just the book numbers. Older engines, rough-running engines, and engines at different power settings burn differently than the POH tables suggest.
• On multi-leg IFR trips, plan a fuel stop whenever your remaining fuel at destination would be less than 1.5 hours at cruise. The regulation says 45 minutes; prudent planning says more.
• If ATC assigns you to hold, begin your fuel calculations immediately. Know how long you can hold before you must divert. Communicate this to ATC: "Approach, Cessna 12345 can hold for 20 minutes before divert is required."

Filing an IFR flight plan is the formal step that puts your flight into the ATC system. Unlike VFR flight plans (which are optional in most airspace), IFR flight plans are mandatory for operations in controlled airspace under instrument flight rules.

How to File

You can file an IFR flight plan through several channels:

• 1800wxbrief.com (Leidos): The official FAA-contracted weather and flight plan service. File online, by phone, or via their app. This also satisfies the requirement for a weather briefing.
• ForeFlight / Garmin Pilot / FlyQ: EFB apps allow you to plan your route, check weather, and file your flight plan all in one interface. Most popular option for general aviation pilots.
• Phone (1-800-WX-BRIEF): Call Leidos Flight Service for a weather briefing and file your plan verbally. Useful when you want a specialist to review your route.
• Clearance Delivery (Popup): At some airports, especially in less congested areas, you can request a "popup" IFR clearance from ATC without filing in advance. This is not guaranteed and should not be your primary plan.

Key Fields in the IFR Flight Plan

• Aircraft ID: Your full tail number (e.g., N12345).
• Aircraft type/equipment: Includes your aircraft type and equipment suffix (e.g., C172/G for a GPS-equipped Cessna 172). The equipment suffix tells ATC what navigation and surveillance capabilities your aircraft has.
• Departure airport: Four-letter ICAO identifier (e.g., KAPA).
• Proposed departure time: In Zulu (UTC) time. File at least 30 minutes before your intended departure.
• Cruise altitude: Your requested altitude. Must be at or above MEAs along your route. Follow hemispheric rule below FL180 (odd thousands eastbound, even thousands westbound based on magnetic course).
• Route: Your complete route string including SIDs, airways, waypoints, direct segments, and STARs.
• Destination airport: Four-letter ICAO identifier.
• Estimated time en route: Total time from departure to destination.
• Fuel on board: Total endurance in hours and minutes.
• Alternate airport: Required unless destination meets 1-2-3 rule criteria.
• Remarks: Include "NO SID/STAR" if applicable, equipment notes, or other relevant information.

Filing Tips

• File preferred routes when they exist between your city pair. You are much more likely to get your route as filed.
• If filing direct, include at least one or two en route waypoints so ATC can issue a partial route amendment if needed rather than a completely new clearance.
• Double-check your equipment suffix. An incorrect suffix can result in a route that your aircraft cannot fly (e.g., being assigned a GPS-dependent route without a GPS suffix).
• File early. Flight plans filed at least 1 hour before departure are processed more reliably by the ATC system.

Once your flight plan is filed and you are ready to depart, you need to obtain your IFR clearance from ATC. At towered airports, contact Clearance Delivery. At non-towered airports, contact the appropriate ATC facility by radio or phone (the frequency or phone number is published in the Chart Supplement).

The CRAFT acronym is the standard format for copying your IFR clearance. Write it down. Even experienced pilots write down their clearance. Trying to memorize a complex clearance is a recipe for errors.

Clearance Readback

After copying your clearance, read it back in full. This is not optional for IFR clearances. ATC will correct any errors in your readback. A proper readback includes: your callsign, clearance limit, route (every fix and airway), initial altitude, expected altitude, departure frequency, and transponder code.

If the clearance is long or complex and you missed something, do not guess. Ask ATC to repeat the portion you missed: "Cessna 12345, say again the route after BOVIC." ATC expects this and prefers it to an incorrect readback.

Clearance Void Time (Non-Towered Airports)

At non-towered airports, ATC will issue a clearance with a void time: "Clearance void if not off by 1530 Zulu." You must be airborne before the void time. If you cannot depart by the void time, you must contact ATC to request a new clearance. Taking off after the void time means your clearance is no longer valid, and you are flying IFR without a clearance in controlled airspace.

At non-towered fields, ATC also issues a release time in some cases: "Released for departure. Clearance void if not off by 1530 Zulu. If not off by 1530, advise [facility] not later than 1545 of intentions." Note the requirement to contact ATC if you cannot make the void time.

Once airborne and established on your cleared route, the en route phase begins. IFR en route flying involves maintaining your assigned altitude and route, communicating with ATC, monitoring weather, and preparing for the arrival phase.

Position Reports

When operating in radar contact (which is most of the time in the US), ATC does not require routine position reports because they can see your position on radar. However, if ATC advises "radar contact lost" or if you are operating in a non-radar environment (common internationally and in some remote US areas), you must make position reports at compulsory reporting points (marked with a solid triangle on en route charts).

Frequency Changes

As you fly through different ATC sectors, you will be handed off from one controller to the next. ATC will instruct: "Cessna 12345, contact Denver Center on 132.45." Read back the new frequency and your callsign, then switch. If you cannot reach the new controller, return to the previous frequency and advise.

Monitor 121.5 MHz (the emergency frequency) on your second radio if you have one. This is recommended but not required for Part 91 operations. It can alert you to emergency situations or traffic that ATC may be trying to reach.

Altitude Changes

ATC may assign you a new altitude for traffic separation, weather avoidance, or to transition you to the arrival phase. When issued an altitude change, read back the new altitude, begin your climb or descent, and report reaching the new altitude if requested. You may also request an altitude change from ATC if you encounter icing, turbulence, or if you want a more efficient altitude for wind conditions.

Holding Patterns

ATC may issue holding instructions when there are delays at your destination. A holding clearance includes: the holding fix, the direction of holding (e.g., "hold southwest"), the radial or course to hold on, the leg length or timing, the expect-further-clearance (EFC) time, and any altitude restrictions.

When issued a hold, immediately note the EFC time. This is critical for lost communications procedures. If you lose comms while holding, you depart the hold at the EFC time and proceed to your destination. Also begin tracking your fuel burn in the hold. Every minute in a holding pattern is fuel you will not have for the approach, missed approach, or diversion.

Use our Holding Pattern Entry Tool to practice determining the correct entry (direct, teardrop, or parallel) for any holding pattern assignment.

Lost Communications (NORDO)

If you lose two-way radio communication during an IFR flight, follow 14 CFR 91.185. This regulation is one of the most important to have memorized as an instrument pilot:

• Squawk 7600 on your transponder.
• Route (AVEF): Fly the route Assigned, Vectored, Expected, or Filed, in that order of priority.
• Altitude (MEA): Fly the highest of the altitude assigned in the last clearance, the altitude expected per ATC, or the Minimum En Route Altitude for each segment.
• Timing: Begin your approach at the later of: your ETA (from the filed flight plan, adjusted for actual en route times) or the EFC time, if one was issued.

If VMC conditions exist, consider cancelling IFR and proceeding VFR if you can maintain VFR cloud clearance and visibility requirements. This is often the simplest resolution.

Approach planning should begin during your pre-flight preparation, not when you are 20 miles from the airport in the clouds. Thorough approach briefing reduces workload during the most critical phase of IFR flight and significantly improves your chances of a successful approach to landing.

The Approach Briefing

Brief every approach before you fly it. A thorough approach briefing covers these elements:

• Approach type and runway: "ILS Runway 28 Left."
• Final approach course: The inbound heading on the final approach segment.
• Decision altitude / MDA: The altitude at which you must have the runway environment in sight or execute the missed approach.
• Missed approach procedure: Brief this in detail. In a missed approach, you are going to be busy. Knowing the procedure cold reduces errors.
• Frequencies: Approach control, tower, ILS/VOR frequency, ATIS/AWOS.
• Timing or distance for the final approach: Especially for non-precision approaches where you need to identify the missed approach point.
• NOTAMs: Confirm no equipment outages affect your approach.

Always Brief a Backup Approach

Do not go into the clouds with only one approach plan. Always brief at least two approaches: your primary approach and a backup. Reasons you might need the backup:

• The ILS glideslope is NOTAM'd out of service (you would fly the LOC approach instead).
• The wind shifts and ATC changes the active runway.
• Traffic sequencing requires a different approach.
• A circling approach is needed to reach the runway in use.
• Your GPS loses RAIM prediction and you cannot fly the LPV.

Brief the backup before you need it. Switching approaches in the terminal area while managing descent, configuration, and communications is high workload. Having already briefed the backup makes the transition manageable.

The decision to divert is one of the hardest decisions a pilot faces. "Get-there-itis" is powerful, and the desire to complete the planned flight is deeply human. But the most important skill in IFR flying is not flying a perfect approach to minimums. It is recognizing when the flight cannot be completed safely and acting on that recognition.

Divert Triggers

Consider diverting to your alternate when any of these conditions exist:

• Weather below minimums: If the most recent weather report or pilot reports indicate that conditions at your destination are below the minimums for your planned approach, divert before you start the approach. Do not fly an approach to "take a look" when the weather is clearly below minimums.
• Missed approach: After executing a missed approach, critically evaluate whether a second attempt is justified. If conditions have not changed, a second approach will have the same result. If conditions are deteriorating, a second approach may put you in a worse position with less fuel.
• Fuel state: If your remaining fuel after a missed approach would not allow a comfortable flight to your alternate plus reserves, divert now while you have options.
• Pilot fatigue or stress: If you are exhausted, task-saturated, or making errors, the safest option is often the nearest suitable airport rather than pressing on to a destination with challenging weather.
• Equipment malfunction: Loss of a vacuum pump, navigation equipment failure, or partial panel conditions may make the planned approach unsafe. Divert to an airport with better weather and a simpler approach.
• Icing accumulation: If you are accumulating ice faster than your systems can remove it, the approach and landing phase (lower speeds, higher angles of attack) is the most dangerous time. Divert to an airport below the freezing level.

The Two-Approach Rule

Many experienced IFR pilots follow a personal "two-approach rule": if you miss two approaches at the same airport, you divert. Period. No exceptions. This removes the emotional decision-making from the equation and prevents the dangerous spiral of "just one more try." Some pilots set their limit at one missed approach. Your personal rule should match your experience level and the conditions.

Communicating with ATC

ATC is your partner in the diversion process. When you decide to divert, communicate clearly: "Approach, Cessna 12345, unable approach at [destination], requesting diversion to [alternate]." ATC will provide vectors and a clearance to your alternate. If fuel is critical, do not hesitate to declare minimum fuel or an emergency. ATC will prioritize you accordingly.

If you plan to fly IFR outside the United States, you need to understand the differences between FAA procedures (which govern domestic US operations) and ICAO standards (which govern most of the rest of the world). While the fundamentals of instrument flying are the same, the procedural details can catch you off guard.

Key Considerations for International IFR

• ICAO flight plan format: Required for all international flights and increasingly accepted domestically. The ICAO format is more detailed than the FAA format, with specific fields for PBN capabilities, surveillance equipment, and aircraft performance.
• Transition altitude/level: In the US, the transition altitude is always 18,000 feet MSL. Internationally, it varies by country and even by airport. Below the transition altitude, you use QNH (local altimeter setting). Above the transition level, you use standard pressure (1013.25 hPa or 29.92 inHg). The transition layer between them is where you switch.
• Metric altitudes: China and some former Soviet states use meters for altitude instead of feet. If flying in these regions, know the conversion and verify your altimeter is reading correctly.
• Language: ICAO requires English for international aviation communication, but not all controllers are fluent. Speak slowly, use standard phraseology, and confirm clearances carefully.
• Overflight permits: Some countries require advance permission to enter their airspace. Research permit requirements well in advance of your planned flight date.
• NAT tracks: If crossing the North Atlantic, you will use the North Atlantic Track system (NAT tracks), which are published daily based on jet stream position. These require specific equipment (HF radio, RVSM, MNPS/NAT-HLA compliance) and procedures.