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SPF to ISN: distance & flight time
Spearfish-South Dakota (Black Hills Airport-Clyde Ice Field) → Williston (Sloulin Field International Airport)
256 mi
411 km · 222 nm
1h 8m
estimated nonstop flight time
+1h
time difference · heading north
See live SPF→ISN fares Phone-only fares on this route — call free
Flight time details
256 miles nonstop takes roughly 1h 8m gate to gate, flying north. 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
- SPF — Black Hills Airport-Clyde Ice Field · Spearfish-South Dakota, 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 SPF
- RCA · Ellsworth Air Force Base41 mi away
- RAP · Rapid City Regional Airport47 mi away
- GCC · Gillette Campbell County Airport87 mi away
- CDR · Chadron Municipal Airport119 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 SPF from ISN?
The flight distance from Spearfish-South Dakota (SPF) to Williston (ISN) is 256 miles (411 km, 222 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SPF to ISN?
A nonstop flight takes about 1h 8m 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 Spearfish-South Dakota and Williston?
Williston is 1 hour ahead of Spearfish-South Dakota.
What is the cheapest way to fly from SPF to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SPF–ISN that never appear on search engines, with no booking fees.