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ISN to SPF: distance & flight time
Williston (Sloulin Field International Airport) → Spearfish-South Dakota (Black Hills Airport-Clyde Ice Field)
256 mi
411 km · 222 nm
1h 8m
estimated nonstop flight time
-1h
time difference · heading south
See live ISN→SPF fares Phone-only fares on this route — call free
Flight time details
256 miles nonstop takes roughly 1h 8m gate to gate, flying south. 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
- ISN — Sloulin Field International Airport · Williston, United States
- SPF — Black Hills Airport-Clyde Ice Field · Spearfish-South Dakota, 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 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 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
Frequently asked questions
How far is ISN from SPF?
The flight distance from Williston (ISN) to Spearfish-South Dakota (SPF) is 256 miles (411 km, 222 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISN to SPF?
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 Williston and Spearfish-South Dakota?
Spearfish-South Dakota is 1 hour behind Williston.
What is the cheapest way to fly from ISN to SPF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–SPF that never appear on search engines, with no booking fees.