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ALN to BFI: distance & flight time
Alton/St Louis (St Louis Regional Airport) → Seattle (Boeing Field King County International Airport)
1,716 mi
2,761 km · 1,491 nm
3h 50m
estimated nonstop flight time
—
time difference · heading northwest
See live ALN→BFI fares Phone-only fares on this route — call free
Flight time details
1,716 miles nonstop takes roughly 3h 50m gate to gate, flying northwest. 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
- ALN — St Louis Regional Airport · Alton/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 ALN
- STL · St Louis Lambert International Airport20 mi away
- BLV · Scott AFB/Midamerica Airport26 mi away
- SUS · Spirit of St Louis Airport36 mi away
- SPI · Abraham Lincoln Capital Airport69 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 ALN from BFI?
The flight distance from Alton/St Louis (ALN) to Seattle (BFI) is 1,716 miles (2,761 km, 1,491 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ALN to BFI?
A nonstop flight takes about 3h 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 cheapest way to fly from ALN to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ALN–BFI that never appear on search engines, with no booking fees.