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GMP to OSN: distance & flight time
Seoul (Gimpo International Airport) → Osan (Osan Air Base)
35 mi
56 km · 30 nm
34m
estimated nonstop flight time
Same time
time difference · heading south
See live GMP→OSN fares Phone-only fares on this route — call free
Flight time details
35 miles nonstop takes roughly 34m gate to gate, flying south. 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
- GMP — Gimpo International Airport · Seoul, South Korea
- 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 GMP
- ICN · Incheon International Airport20 mi away
- SSN · Seoul Air Base (K-16)19 mi away
- SWU · Suwon Airport25 mi away
- OSN · Osan Air Base35 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 GMP from OSN?
The flight distance from Seoul (GMP) to Osan (OSN) is 35 miles (56 km, 30 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GMP to OSN?
A nonstop flight takes about 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 GMP to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GMP–OSN that never appear on search engines, with no booking fees.