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HLN to OSN: distance & flight time
Helena (Helena Regional Airport) → Osan (Osan Air Base)
5,598 mi
9,009 km · 4,864 nm
11h 27m
estimated nonstop flight time
+15h
time difference · heading northwest
See live HLN→OSN fares Phone-only fares on this route — call free
Flight time details
5,598 miles nonstop takes roughly 11h 27m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 15-hour time gain when reading arrival times on your ticket.
The two airports
- HLN — Helena Regional Airport · Helena, United States
- OSN — Osan Air Base · Osan, South Korea
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 OSN
- ICN · Incheon International Airport41 mi away
- SWU · Suwon Airport10 mi away
- SSN · Seoul Air Base (K-16)25 mi away
- GMP · Gimpo International Airport35 mi away
Frequently asked questions
How far is HLN from OSN?
The flight distance from Helena (HLN) to Osan (OSN) is 5,598 miles (9,009 km, 4,864 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to OSN?
A nonstop flight takes about 11h 27m 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 Osan?
Osan is 15 hours ahead of Helena.
What is the cheapest way to fly from HLN to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–OSN that never appear on search engines, with no booking fees.