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LHR to SEA: distance & flight time
London (London Heathrow Airport) → Seattle (Seattle Tacoma International Airport)
4,786 mi
7,702 km · 4,159 nm
9h 51m
estimated nonstop flight time
-8h
time difference · heading northwest
See live LHR→SEA fares Phone-only fares on this route — call free
Flight time details
4,786 miles nonstop takes roughly 9h 51m 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
- SEA — Seattle Tacoma 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 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
Frequently asked questions
How far is LHR from SEA?
The flight distance from London (LHR) to Seattle (SEA) 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 LHR to SEA?
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 London and Seattle?
Seattle is 8 hours behind London.
What is the cheapest way to fly from LHR to SEA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on LHR–SEA that never appear on search engines, with no booking fees.