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ISN to OSN: distance & flight time
Williston (Sloulin Field International Airport) → Osan (Osan Air Base)
5,773 mi
9,290 km · 5,016 nm
11h 47m
estimated nonstop flight time
+14h
time difference · heading northwest
See live ISN→OSN fares Phone-only fares on this route — call free
Flight time details
5,773 miles nonstop takes roughly 11h 47m 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
- ISN — Sloulin Field International Airport · Williston, 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 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
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 ISN from OSN?
The flight distance from Williston (ISN) to Osan (OSN) is 5,773 miles (9,290 km, 5,016 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISN to OSN?
A nonstop flight takes about 11h 47m 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 Williston and Osan?
Osan is 14 hours ahead of Williston.
What is the cheapest way to fly from ISN to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–OSN that never appear on search engines, with no booking fees.