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OSN to GRF: distance & flight time
Osan (Osan Air Base) → Fort Lewis (Gray Army Air Field)
5,208 mi
8,382 km · 4,526 nm
10h 41m
estimated nonstop flight time
-16h
time difference · heading northeast
See live OSN→GRF fares Phone-only fares on this route — call free
Flight time details
5,208 miles nonstop takes roughly 10h 41m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time set-back when reading arrival times on your ticket.
The two airports
- OSN — Osan Air Base · Osan, South Korea
- GRF — Gray Army Air Field · Fort Lewis, 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 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
Frequently asked questions
How far is OSN from GRF?
The flight distance from Osan (OSN) to Fort Lewis (GRF) 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 OSN to GRF?
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 Osan and Fort Lewis?
Fort Lewis is 16 hours behind Osan.
What is the cheapest way to fly from OSN to GRF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–GRF that never appear on search engines, with no booking fees.