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HLN to ISN: distance & flight time
Helena (Helena Regional Airport) → Williston (Sloulin Field International Airport)
405 mi
651 km · 352 nm
1h 21m
estimated nonstop flight time
+1h
time difference · heading east
See live HLN→ISN fares Phone-only fares on this route — call free
Flight time details
405 miles nonstop takes roughly 1h 21m 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
- HLN — Helena Regional Airport · Helena, 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 HLN
- BTM · Bert Mooney Airport51 mi away
- GTF · Great Falls International Airport67 mi away
- BZN · Gallatin Field70 mi away
- LVM · Mission Field97 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 HLN from ISN?
The flight distance from Helena (HLN) to Williston (ISN) is 405 miles (651 km, 352 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to ISN?
A nonstop flight takes about 1h 21m 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 Helena and Williston?
Williston is 1 hour ahead of Helena.
What is the cheapest way to fly from HLN to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–ISN that never appear on search engines, with no booking fees.