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SFO to BFI: distance & flight time
San Francisco (San Francisco International Airport) → Seattle (Boeing Field King County International Airport)
685 mi
1,102 km · 595 nm
1h 57m
estimated nonstop flight time
Same time
time difference · heading north
See live SFO→BFI fares Phone-only fares on this route — call free
Flight time details
685 miles nonstop takes roughly 1h 57m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- SFO — San Francisco International Airport · San Francisco, United States
- 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 SFO
- SQL · San Carlos Airport10 mi away
- HAF · Half Moon Bay Airport10 mi away
- OAK · Metropolitan Oakland International Airport11 mi away
- NGZ · Alameda Naval Air Station12 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 SFO from BFI?
The flight distance from San Francisco (SFO) to Seattle (BFI) is 685 miles (1,102 km, 595 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SFO to BFI?
A nonstop flight takes about 1h 57m 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 cheapest way to fly from SFO to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SFO–BFI that never appear on search engines, with no booking fees.