Great-circle route LHR ↔ SEA. Faint dots are other airports, for geographic context. Download this map — free to reuse with a link back to this page.
Frequencies below are per direction, from our most recent schedule sample.
| Direction | Frequency | Days | Airlines |
|---|---|---|---|
| LHR → SEA London to Seattle |
35/wk | Daily | Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic Airways |
| SEA → LHR Seattle to London |
35/wk | Daily | Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic Airways |
Where a direction shows “—” we track it as an operating nonstop but hold no schedule sample for it — we would rather show nothing than guess.
In 2025, airlines reported 531,570 passengers on 2,526 flights between LHR and SEA — about 1,457 a day — filling 81% of the 654,736 seats flown. British Airways Plc carried the most passengers (53%).
Source: US DOT T-100 segment reports — actual airline-reported traffic, scheduled service only, both directions combined. Cargo and charter flights excluded.
4 airlines fly the LHR–SEA nonstop, including Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic Airways.
Recent scheduled departures on this route have used the Boeing 787-10, Airbus A330-900, Boeing 777-300ER Passenger, Boeing 787-9 and 3 other types.
Aircraft assignments change by season and by time of day.
On a long east–west route like this one the two directions do not take the same time. Aircraft flying eastbound ride the mid-latitude jet stream and typically arrive earlier than the westbound leg, which flies into it. The difference is commonly 30 to 90 minutes on transatlantic and transpacific flights, and it varies by season. The estimate above does not model wind — treat it as a midpoint and check the airline's own timetable for the block time on your date.
The distance between London Heathrow Airport and Seattle Tacoma International Airport is 4,786 miles, or 7,702 kilometres.
| Great-circle distance | 4,786 mi |
| Kilometres | 7,702 km |
| Nautical miles | 4,159 nmi |
Measured airport to airport. The actual track is longer — aircraft follow airways, avoid restricted airspace and route around weather.
Yes. 4 airlines fly the route nonstop, with about 70 departures a week across both directions. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 9h 44m in the air. That is a great-circle estimate from the 4,786-mile distance, not a scheduled block time — an airline's published time will differ by roughly 15 to 45 minutes depending on routing, winds and taxi.
About 35 a week from London to Seattle and 35 a week from Seattle to London, from our most recent schedule sample.
Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic Airways.
In 2025, airlines reported 531,570 passengers on 2,526 scheduled flights between LHR and SEA — about 1,457 a day — filling 81% of the seats flown. Source: US DOT T-100 segment reports, both directions combined.
Recent scheduled departures have used the Boeing 787-10, Airbus A330-900, Boeing 777-300ER Passenger, Boeing 787-9. Assignments change by season and by time of day.
