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Heathrow Connection Times 2026: Terminal Transfers and Real Minimums
Heathrow connection times by terminal: the official 60- and 90-minute minimums, realistic buffers, and when an hour at LHR is not enough.
London (LHR) to Seattle (SEA) flights
Nonstop from London Heathrow to Seattle-Tacoma International: distance, flying time, which airlines fly it and how often.
Distance
7,702km
4,786 mi, great circle
Flying time
9h 50m
typical, gate to gate
Flights a day
2.7
average, November 2026
Airlines
2
passenger airlines
Airlines flying LHR to SEA
Route map
The shortest path over the Earth's surface. Actual tracks vary with winds and airspace. Map © OpenStreetMap contributors.
Cheapest recent fare
Fares found in recent searches load here. You can also compare LHR to SEA fares by month.
Both directions
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Frequently asked questions
How long is the flight from London to Seattle?
About 9h 50m gate to gate for the 7,702 km (4,786 mile) trip, estimated from distance. Schedules vary by airline and season, and winds can add or save time.
Which airlines fly nonstop from LHR to SEA?
Alaska Airlines and British Airways, with about 2.7 flights a day between them in our data (AeroDataBox, November 2026).