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SEA to OSN: distance & flight time
Seattle (Seattle Tacoma International Airport) → Osan (Osan Air Base)
5,202 mi
8,372 km · 4,520 nm
10h 40m
estimated nonstop flight time
+16h
time difference · heading northwest
See live SEA→OSN fares Phone-only fares on this route — call free
Flight time details
5,202 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
- SEA — Seattle Tacoma International Airport · Seattle, 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 SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 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 SEA from OSN?
The flight distance from Seattle (SEA) to Osan (OSN) is 5,202 miles (8,372 km, 4,520 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA 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 Seattle and Osan?
Osan is 16 hours ahead of Seattle.
What is the cheapest way to fly from SEA to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–OSN that never appear on search engines, with no booking fees.