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GTF to BFI: distance & flight time
Great Falls (Great Falls International Airport) → Seattle (Boeing Field King County International Airport)
510 mi
820 km · 443 nm
1h 34m
estimated nonstop flight time
-1h
time difference · heading west
See live GTF→BFI fares Phone-only fares on this route — call free
Flight time details
510 miles nonstop takes roughly 1h 34m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time set-back when reading arrival times on your ticket.
The two airports
- GTF — Great Falls International Airport · Great Falls, 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 GTF
- HLN · Helena Regional Airport67 mi away
- CTB · Cut Bank International Airport91 mi away
- LWT · Lewistown Municipal Airport94 mi away
- HVR · Havre City County Airport104 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 GTF from BFI?
The flight distance from Great Falls (GTF) to Seattle (BFI) is 510 miles (820 km, 443 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GTF to BFI?
A nonstop flight takes about 1h 34m 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 Great Falls and Seattle?
Seattle is 1 hour behind Great Falls.
What is the cheapest way to fly from GTF to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GTF–BFI that never appear on search engines, with no booking fees.