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FSI to GMP: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → Seoul (Gimpo International Airport)
6,667 mi
10,729 km · 5,793 nm
13h 32m
estimated nonstop flight time
+14h
time difference · heading northwest
See live FSI→GMP fares Phone-only fares on this route — call free
Flight time details
6,667 miles nonstop takes roughly 13h 32m 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
- GMP — Gimpo International Airport · Seoul, 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 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
Frequently asked questions
How far is FSI from GMP?
The flight distance from Fort Sill (FSI) to Seoul (GMP) 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 FSI to GMP?
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 Fort Sill and Seoul?
Seoul is 14 hours ahead of Fort Sill.
What is the cheapest way to fly from FSI to GMP?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–GMP that never appear on search engines, with no booking fees.