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ISN to ZGF: distance & flight time
Williston (Sloulin Field International Airport) → Grand Forks (Grand Forks Airport)
677 mi
1,090 km · 588 nm
1h 56m
estimated nonstop flight time
—
time difference · heading west
See live ISN→ZGF fares Phone-only fares on this route — call free
Flight time details
677 miles nonstop takes roughly 1h 56m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- ISN — Sloulin Field International Airport · Williston, United States
- ZGF — Grand Forks Airport · Grand Forks, Canada
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 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
Near ZGF
- YZZ · Trail Airport37 mi away
- YCG · Castlegar/West Kootenay Regional Airport41 mi away
- YYF · Penticton Airport61 mi away
- YLW · Kelowna International Airport78 mi away
Frequently asked questions
How far is ISN from ZGF?
The flight distance from Williston (ISN) to Grand Forks (ZGF) is 677 miles (1,090 km, 588 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISN to ZGF?
A nonstop flight takes about 1h 56m 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 ISN to ZGF?
Nonstop service on ISN–ZGF 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 56m nonstop estimate.
What is the cheapest way to fly from ISN to ZGF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–ZGF that never appear on search engines, with no booking fees.
Why are some ISN to ZGF fares phone-only?
Consolidator contracts let us sell certain ISN–ZGF 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.