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OSN to ALN: distance & flight time
Osan (Osan Air Base) → Alton/St Louis (St Louis Regional Airport)
6,682 mi
10,753 km · 5,806 nm
13h 34m
estimated nonstop flight time
—
time difference · heading northeast
See live OSN→ALN fares Phone-only fares on this route — call free
Flight time details
6,682 miles nonstop takes roughly 13h 34m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- OSN — Osan Air Base · Osan, South Korea
- ALN — St Louis Regional Airport · Alton/St Louis, 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 ALN
- STL · St Louis Lambert International Airport20 mi away
- BLV · Scott AFB/Midamerica Airport26 mi away
- SUS · Spirit of St Louis Airport36 mi away
- SPI · Abraham Lincoln Capital Airport69 mi away
Frequently asked questions
How far is OSN from ALN?
The flight distance from Osan (OSN) to Alton/St Louis (ALN) is 6,682 miles (10,753 km, 5,806 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSN to ALN?
A nonstop flight takes about 13h 34m 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 cheapest way to fly from OSN to ALN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–ALN that never appear on search engines, with no booking fees.