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SOU to BFI: distance & flight time
Southampton (Southampton Airport) → Seattle (Boeing Field King County International Airport)
4,785 mi
7,702 km · 4,158 nm
9h 51m
estimated nonstop flight time
-8h
time difference · heading northwest
See live SOU→BFI fares Phone-only fares on this route — call free
Flight time details
4,785 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
- SOU — Southampton Airport · Southampton, 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 SOU
- LGW · London Gatwick Airport52 mi away
- LHR · London Heathrow Airport53 mi away
- QLA · Lasham Airport22 mi away
- BBP · Bembridge Airport22 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 SOU from BFI?
The flight distance from Southampton (SOU) to Seattle (BFI) is 4,785 miles (7,702 km, 4,158 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SOU to BFI?
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 Southampton and Seattle?
Seattle is 8 hours behind Southampton.
What is the cheapest way to fly from SOU to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SOU–BFI that never appear on search engines, with no booking fees.