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GMP to FSI: distance & flight time
Seoul (Gimpo International Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
6,667 mi
10,729 km · 5,793 nm
13h 32m
estimated nonstop flight time
-14h
time difference · heading northeast
See live GMP→FSI fares Phone-only fares on this route — call free
Flight time details
6,667 miles nonstop takes roughly 13h 32m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time set-back when reading arrival times on your ticket.
The two airports
- GMP — Gimpo International Airport · Seoul, South Korea
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 GMP
- ICN · Incheon International Airport20 mi away
- SSN · Seoul Air Base (K-16)19 mi away
- SWU · Suwon Airport25 mi away
- OSN · Osan Air Base35 mi away
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
Frequently asked questions
How far is GMP from FSI?
The flight distance from Seoul (GMP) to Fort Sill (FSI) is 6,667 miles (10,729 km, 5,793 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GMP to FSI?
A nonstop flight takes about 13h 32m 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 Seoul and Fort Sill?
Fort Sill is 14 hours behind Seoul.
What is the cheapest way to fly from GMP to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GMP–FSI that never appear on search engines, with no booking fees.