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GMP to ISN: distance & flight time
Seoul (Gimpo International Airport) → Williston (Sloulin Field International Airport)
5,752 mi
9,257 km · 4,998 nm
11h 45m
estimated nonstop flight time
-15h
time difference · heading northeast
See live GMP→ISN fares Phone-only fares on this route — call free
Flight time details
5,752 miles nonstop takes roughly 11h 45m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 15-hour time set-back when reading arrival times on your ticket.
The two airports
- GMP — Gimpo International Airport · Seoul, South Korea
- ISN — Sloulin Field International Airport · Williston, 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 ISN
- SDY · Sidney - Richland Regional Airport41 mi away
- YEN · Estevan Airport78 mi away
- OLF · L M Clayton Airport89 mi away
- GDV · Dawson Community Airport90 mi away
Frequently asked questions
How far is GMP from ISN?
The flight distance from Seoul (GMP) to Williston (ISN) is 5,752 miles (9,257 km, 4,998 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GMP to ISN?
A nonstop flight takes about 11h 45m 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 ISN?
Nonstop service on GMP–ISN 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 11h 45m nonstop estimate.
What is the time difference between Seoul and Williston?
Williston is 15 hours behind Seoul.
What is the cheapest way to fly from GMP to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GMP–ISN that never appear on search engines, with no booking fees.
Why are some GMP to ISN fares phone-only?
Consolidator contracts let us sell certain GMP–ISN 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.