Need help booking?
Unpublished phone-only deals available
GMP to DUC: distance & flight time
Seoul (Gimpo International Airport) → Duncan (Halliburton Field)
6,691 mi
10,768 km · 5,814 nm
13h 35m
estimated nonstop flight time
-14h
time difference · heading northeast
See live GMP→DUC fares Phone-only fares on this route — call free
Flight time details
6,691 miles nonstop takes roughly 13h 35m 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
- DUC — Halliburton Field · Duncan, 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 DUC
Frequently asked questions
How far is GMP from DUC?
The flight distance from Seoul (GMP) to Duncan (DUC) is 6,691 miles (10,768 km, 5,814 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GMP to DUC?
A nonstop flight takes about 13h 35m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from GMP to DUC?
Nonstop service on GMP–DUC depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 13h 35m nonstop estimate.
What is the time difference between Seoul and Duncan?
Duncan is 14 hours behind Seoul.
What is the cheapest way to fly from GMP to DUC?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GMP–DUC that never appear on search engines, with no booking fees.
Why are some GMP to DUC fares phone-only?
Consolidator contracts let us sell certain GMP–DUC tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.