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Flights from Seattle to London
There are no direct flights from Seattle to London. The fastest way is one stop via Calgary or Toronto, about 5h 35m door to door (18 connections a week on current schedules).
No direct flights · 2 connection options From 5h 35m
Seattle to London at a glance
Fastest journey5h 35mVia Calgary, on current schedules
Nonstop flightsNoneConnect via Calgary or Toronto
Best ways to fly from Seattle to London
Ranked by how easy the connection is: one airline or alliance first (bags and connection protected), then the quickest self-transfer options.
1Search
SEA Calgary (YYC) YXU
Leg 1: Alaska Airlines, WestJet, WestJet Encore · Leg 2: WestJet
Mon20:30 SEA22:56 YYC0h 49m connection23:45 YYC05:05 YXUWestJet
2Search
SEA Toronto (YYZ) YXU
Leg 1: Air Canada, Alaska Airlines · Leg 2: Air Canada Jazz
Sat08:00 SEA15:22 YYZ3h 23m connection18:45 YYZ19:22 YXUAir Canada + Air Canada Jazz
Connections are computed from flights actually flown over the last 8 weeks, with at least 45 minutes to change on one airline and 2 hours on separate tickets. Times are local. The search shows live itineraries and exact times.
Good to know
- Distance
- 3,215 km1,997 miles
- Journey time
- 5h 35mon current schedules
- Time difference
- +3hLondon vs Seattle
- Currency in London
- CAD
- Airports
- SEA, BFI → YXU
Flights from Seattle to London: questions answered
Are there direct flights from Seattle to London?
No. There is no nonstop service, so you will connect, most easily in Calgary and Toronto. Some connections are on one airline or alliance, so your bags and connection are protected on a single ticket.
How long is the flight from Seattle to London?
With one connection the journey usually takes around 5h 35m, depending on the layover. The straight-line distance is 3,215 km.
Where do you change planes between Seattle and London?
The best connecting points are Calgary (YYC) and Toronto (YYZ). Alaska Airlines flies both legs via Calgary, so you can book it as one ticket.
Which airports serve Seattle and London?
Seattle: Seattle–Tacoma International Airport (SEA) and King County International Airport - Boeing Field (BFI). London: London International Airport (YXU).
What is the time difference between Seattle and London?
London is 3 hours ahead of Seattle.
