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STL to BFI: distance & flight time
St. Louis (St Louis Lambert International Airport) → Seattle (Boeing Field King County International Airport)
1,706 mi
2,745 km · 1,482 nm
3h 49m
estimated nonstop flight time
-2h
time difference · heading northwest
See live STL→BFI fares Phone-only fares on this route — call free
Flight time details
1,706 miles nonstop takes roughly 3h 49m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time set-back when reading arrival times on your ticket.
The two airports
- STL — St Louis Lambert International Airport · St. Louis, 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 STL
- SUS · Spirit of St Louis Airport16 mi away
- ALN · St Louis Regional Airport20 mi away
- BLV · Scott AFB/Midamerica Airport32 mi away
- SPI · Abraham Lincoln Capital Airport84 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 STL from BFI?
The flight distance from St. Louis (STL) to Seattle (BFI) is 1,706 miles (2,745 km, 1,482 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from STL to BFI?
A nonstop flight takes about 3h 49m 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 St. Louis and Seattle?
Seattle is 2 hours behind St. Louis.
What is the cheapest way to fly from STL to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on STL–BFI that never appear on search engines, with no booking fees.