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FSI to GTF: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → Great Falls (Great Falls International Airport)
1,111 mi
1,789 km · 966 nm
2h 53m
estimated nonstop flight time
-1h
time difference · heading northwest
See live FSI→GTF fares Phone-only fares on this route — call free
Flight time details
1,111 miles nonstop takes roughly 2h 53m gate to gate, flying northwest. 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
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, United States
- GTF — Great Falls International Airport · Great Falls, 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 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
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
Frequently asked questions
How far is FSI from GTF?
The flight distance from Fort Sill (FSI) to Great Falls (GTF) is 1,111 miles (1,789 km, 966 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FSI to GTF?
A nonstop flight takes about 2h 53m 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 Fort Sill and Great Falls?
Great Falls is 1 hour behind Fort Sill.
What is the cheapest way to fly from FSI to GTF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–GTF that never appear on search engines, with no booking fees.