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FSI to OSN: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → Osan (Osan Air Base)
6,685 mi
10,759 km · 5,809 nm
13h 34m
estimated nonstop flight time
+14h
time difference · heading northwest
See live FSI→OSN fares Phone-only fares on this route — call free
Flight time details
6,685 miles nonstop takes roughly 13h 34m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 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 FSI from OSN?
The flight distance from Fort Sill (FSI) to Osan (OSN) is 6,685 miles (10,759 km, 5,809 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FSI to OSN?
A nonstop flight takes about 13h 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 time difference between Fort Sill and Osan?
Osan is 14 hours ahead of Fort Sill.
What is the cheapest way to fly from FSI to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–OSN that never appear on search engines, with no booking fees.