LHR to SEA Route Guide
London, United Kingdom → Seattle, United States
Quick answer
EGLL (London, United Kingdom) to KSEA (Seattle, United States) is a 4,158 NM (7,701 km / 4,785 mi) great-circle route with an initial bearing of 322° (NW). Typical cruise altitude FL410, expected flight time 9h 10m, common aircraft: Boeing 777-300ER, Airbus A350-900, Boeing 787-9.
Distance
4,158 NM
7,701 km / 4,785 mi
Initial Bearing
322° (NW)
True heading at departure
Typical Cruise
FL410
41,000 ft
Block Time
9h 10m
Typical jet, no wind correction
Fuel Estimate
13,974 kg
Single-aisle equivalent + reserve
Departure Elevation
83 ft
EGLL
Arrival Elevation
433 ft
KSEA
What aircraft fly this route?
For a 4,158 NM mission, operators typically deploy:
- Boeing 777-300ER
- Airbus A350-900
- Boeing 787-9
- Airbus A330-900neo
Weather considerations
Pilots flying LHR-SEA should brief METARs and TAFs at both ends, plus any en-route SIGMETs. On this long-range mission, plan for an alternate within fuel reserves and review oceanic / NAT track procedures if applicable.
Frequently asked questions
What is the distance between LHR and SEA?
4,158 nautical miles (7,701 km / 4,785 statute miles) great-circle.
How long is the flight from London to Seattle?
Approximately 9h 10m block-to-block for a typical commercial jet, depending on aircraft type and winds.
What aircraft typically fly LHR-SEA?
Common types include Boeing 777-300ER, Airbus A350-900, Boeing 787-9, Airbus A330-900neo depending on operator and demand.
What altitude do flights cruise at?
Most flights at this distance cruise around FL410 (41,000 ft), though winds and traffic affect filed altitude.
What initial heading is the route?
322° true (NW). Track varies along the route due to great-circle curvature.
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