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GRF to OSN: distance & flight time
Fort Lewis (Gray Army Air Field) → Osan (Osan Air Base)
5,208 mi
8,382 km · 4,526 nm
10h 41m
estimated nonstop flight time
+16h
time difference · heading northwest
See live GRF→OSN fares Phone-only fares on this route — call free
Flight time details
5,208 miles nonstop takes roughly 10h 41m 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
- GRF — Gray Army Air Field · Fort Lewis, 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 GRF
- SEA · Seattle Tacoma International Airport29 mi away
- TCM · McChord Air Force Base6 mi away
- TIW · Tacoma Narrows Airport13 mi away
- OLM · Olympia Regional Airport17 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 GRF from OSN?
The flight distance from Fort Lewis (GRF) to Osan (OSN) is 5,208 miles (8,382 km, 4,526 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRF to OSN?
A nonstop flight takes about 10h 41m 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 Fort Lewis and Osan?
Osan is 16 hours ahead of Fort Lewis.
What is the cheapest way to fly from GRF to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRF–OSN that never appear on search engines, with no booking fees.