SEA to LHR Route Guide
Seattle, United States → London, United Kingdom
Quick answer
KSEA (Seattle, United States) to EGLL (London, United Kingdom) is a 4,158 NM (7,701 km / 4,785 mi) great-circle route with an initial bearing of 34° (NE). 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
34° (NE)
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
433 ft
KSEA
Arrival Elevation
83 ft
EGLL
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 SEA-LHR 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 SEA and LHR?
4,158 nautical miles (7,701 km / 4,785 statute miles) great-circle.
How long is the flight from Seattle to London?
Approximately 9h 10m block-to-block for a typical commercial jet, depending on aircraft type and winds.
What aircraft typically fly SEA-LHR?
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?
34° true (NE). Track varies along the route due to great-circle curvature.
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