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GTF to ISN: distance & flight time
Great Falls (Great Falls International Airport) → Williston (Sloulin Field International Airport)
362 mi
582 km · 314 nm
1h 25m
estimated nonstop flight time
+1h
time difference · heading east
See live GTF→ISN fares Phone-only fares on this route — call free
Flight time details
362 miles nonstop takes roughly 1h 25m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time gain when reading arrival times on your ticket.
The two airports
- GTF — Great Falls International Airport · Great Falls, United States
- ISN — Sloulin Field International Airport · Williston, 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 ISN
- SDY · Sidney - Richland Regional Airport41 mi away
- YEN · Estevan Airport78 mi away
- OLF · L M Clayton Airport89 mi away
- GDV · Dawson Community Airport90 mi away
Frequently asked questions
How far is GTF from ISN?
The flight distance from Great Falls (GTF) to Williston (ISN) is 362 miles (582 km, 314 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GTF to ISN?
A nonstop flight takes about 1h 25m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from GTF to ISN?
Nonstop service on GTF–ISN depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 1h 25m nonstop estimate.
What is the time difference between Great Falls and Williston?
Williston is 1 hour ahead of Great Falls.
What is the cheapest way to fly from GTF to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GTF–ISN that never appear on search engines, with no booking fees.
Why are some GTF to ISN fares phone-only?
Consolidator contracts let us sell certain GTF–ISN tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.