Need help booking?
Unpublished phone-only deals available
LHR to BFI: distance & flight time
London (London Heathrow Airport) → Seattle (Boeing Field King County International Airport)
4,781 mi
7,694 km · 4,155 nm
9h 50m
estimated nonstop flight time
-8h
time difference · heading northwest
See live LHR→BFI fares Phone-only fares on this route — call free
Flight time details
4,781 miles nonstop takes roughly 9h 50m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 8-hour time set-back when reading arrival times on your ticket.
The two airports
- LHR — London Heathrow Airport · London, United Kingdom
- BFI — Boeing Field King County International Airport · Seattle, United States
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 LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 mi away
Near BFI
- SEA · Seattle Tacoma International Airport6 mi away
- RNT · Renton Municipal Airport5 mi away
- PWT · Bremerton National Airport22 mi away
- TIW · Tacoma Narrows Airport22 mi away
Frequently asked questions
How far is LHR from BFI?
The flight distance from London (LHR) to Seattle (BFI) is 4,781 miles (7,694 km, 4,155 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from LHR to BFI?
A nonstop flight takes about 9h 50m 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 London and Seattle?
Seattle is 8 hours behind London.
What is the cheapest way to fly from LHR to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on LHR–BFI that never appear on search engines, with no booking fees.