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GRF to ISN: distance & flight time
Fort Lewis (Gray Army Air Field) → Williston (Sloulin Field International Airport)
883 mi
1,421 km · 767 nm
2h 23m
estimated nonstop flight time
+2h
time difference · heading east
See live GRF→ISN fares Phone-only fares on this route — call free
Flight time details
883 miles nonstop takes roughly 2h 23m gate to gate, flying east. 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
- GRF — Gray Army Air Field · Fort Lewis, 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 GRF
- SEA · Seattle Tacoma International Airport29 mi away
- TCM · McChord Air Force Base6 mi away
- TIW · Tacoma Narrows Airport13 mi away
- OLM · Olympia Regional Airport17 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 GRF from ISN?
The flight distance from Fort Lewis (GRF) to Williston (ISN) is 883 miles (1,421 km, 767 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRF to ISN?
A nonstop flight takes about 2h 23m 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 Lewis and Williston?
Williston is 2 hours ahead of Fort Lewis.
What is the cheapest way to fly from GRF to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRF–ISN that never appear on search engines, with no booking fees.