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OSN to BTM: distance & flight time
Osan (Osan Air Base) → Butte (Bert Mooney Airport)
5,613 mi
9,034 km · 4,878 nm
11h 28m
estimated nonstop flight time
-15h
time difference · heading northeast
See live OSN→BTM fares Phone-only fares on this route — call free
Flight time details
5,613 miles nonstop takes roughly 11h 28m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 15-hour time set-back when reading arrival times on your ticket.
The two airports
- OSN — Osan Air Base · Osan, South Korea
- BTM — Bert Mooney Airport · Butte, 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 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
Near BTM
- HLN · Helena Regional Airport51 mi away
- BZN · Gallatin Field66 mi away
- SMN · Lemhi County Airport88 mi away
- LVM · Mission Field100 mi away
Frequently asked questions
How far is OSN from BTM?
The flight distance from Osan (OSN) to Butte (BTM) is 5,613 miles (9,034 km, 4,878 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSN to BTM?
A nonstop flight takes about 11h 28m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from OSN to BTM?
Nonstop service on OSN–BTM depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 11h 28m nonstop estimate.
What is the time difference between Osan and Butte?
Butte is 15 hours behind Osan.
What is the cheapest way to fly from OSN to BTM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–BTM that never appear on search engines, with no booking fees.
Why are some OSN to BTM fares phone-only?
Consolidator contracts let us sell certain OSN–BTM tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.