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BFI to FSI: distance & flight time
Seattle (Boeing Field King County International Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
1,520 mi
2,446 km · 1,321 nm
3h 27m
estimated nonstop flight time
+2h
time difference · heading southeast
See live BFI→FSI fares Phone-only fares on this route — call free
Flight time details
1,520 miles nonstop takes roughly 3h 27m gate to gate, flying southeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 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
Near FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 mi away
Frequently asked questions
How far is BFI from FSI?
The flight distance from Seattle (BFI) to Fort Sill (FSI) is 1,520 miles (2,446 km, 1,321 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to FSI?
A nonstop flight takes about 3h 27m 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 Seattle and Fort Sill?
Fort Sill is 2 hours ahead of Seattle.
What is the cheapest way to fly from BFI to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–FSI that never appear on search engines, with no booking fees.