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Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–HLN that never appear on search engines, with no booking fees.