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OSN to FNL: distance & flight time
Osan (Osan Air Base) → Fort Collins (Northern Colorado Regional Airport)
6,147 mi
9,893 km · 5,342 nm
12h 31m
estimated nonstop flight time
-15h
time difference · heading northeast
See live OSN→FNL fares Phone-only fares on this route — call free
Flight time details
6,147 miles nonstop takes roughly 12h 31m 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
- FNL — Northern Colorado Regional Airport · Fort Collins, 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 FNL
- DEN · Denver International Airport45 mi away
- GXY · Greeley–Weld County Airport20 mi away
- WBU · Boulder Municipal Airport31 mi away
- BJC · Rocky Mountain Metropolitan Airport38 mi away
Frequently asked questions
How far is OSN from FNL?
The flight distance from Osan (OSN) to Fort Collins (FNL) is 6,147 miles (9,893 km, 5,342 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSN to FNL?
A nonstop flight takes about 12h 31m 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 Osan and Fort Collins?
Fort Collins is 15 hours behind Osan.
What is the cheapest way to fly from OSN to FNL?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–FNL that never appear on search engines, with no booking fees.