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AST to OSN: distance & flight time
Astoria (Astoria Regional Airport) → Osan (Osan Air Base)
5,201 mi
8,370 km · 4,519 nm
10h 40m
estimated nonstop flight time
+16h
time difference · heading northwest
See live AST→OSN fares Phone-only fares on this route — call free
Flight time details
5,201 miles nonstop takes roughly 10h 40m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time gain when reading arrival times on your ticket.
The two airports
- AST — Astoria Regional Airport · Astoria, 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 AST
- KLS · Southwest Washington Regional Airport47 mi away
- OTK · Tillamook Airport51 mi away
- HQM · Bowerman Airport56 mi away
- CLS · Chehalis Centralia Airport56 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 AST from OSN?
The flight distance from Astoria (AST) to Osan (OSN) is 5,201 miles (8,370 km, 4,519 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from AST to OSN?
A nonstop flight takes about 10h 40m 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 Astoria and Osan?
Osan is 16 hours ahead of Astoria.
What is the cheapest way to fly from AST to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on AST–OSN that never appear on search engines, with no booking fees.