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OSN to ISN: distance & flight time
Osan (Osan Air Base) → Williston (Sloulin Field International Airport)
5,773 mi
9,290 km · 5,016 nm
11h 47m
estimated nonstop flight time
-15h
time difference · heading northeast
See live OSN→ISN fares Phone-only fares on this route — call free
Flight time details
5,773 miles nonstop takes roughly 11h 47m 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
- OSN — Osan Air Base · Osan, 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 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
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 OSN from ISN?
The flight distance from Osan (OSN) to Williston (ISN) 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 OSN to ISN?
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.
Are there nonstop flights from OSN to ISN?
Nonstop service on OSN–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 47m nonstop estimate.
What is the time difference between Osan and Williston?
Williston is 15 hours behind Osan.
What is the cheapest way to fly from OSN to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–ISN that never appear on search engines, with no booking fees.
Why are some OSN to ISN fares phone-only?
Consolidator contracts let us sell certain OSN–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.