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SEA to LHR: distance & flight time
Seattle (Seattle Tacoma International Airport) → London (London Heathrow Airport)
4,786 mi
7,702 km · 4,159 nm
9h 51m
estimated nonstop flight time
+8h
time difference · heading northeast
See live SEA→LHR fares Phone-only fares on this route — call free
Flight time details
4,786 miles nonstop takes roughly 9h 51m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 8-hour time gain when reading arrival times on your ticket.
The two airports
- SEA — Seattle Tacoma International Airport · Seattle, United States
- LHR — London Heathrow Airport · London, United Kingdom
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Near LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 mi away
Frequently asked questions
How far is SEA from LHR?
The flight distance from Seattle (SEA) to London (LHR) is 4,786 miles (7,702 km, 4,159 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA to LHR?
A nonstop flight takes about 9h 51m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Seattle and London?
London is 8 hours ahead of Seattle.
What is the cheapest way to fly from SEA to LHR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–LHR that never appear on search engines, with no booking fees.