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ONT to OSN: distance & flight time
Ontario (Ontario International Airport) → Osan (Osan Air Base)
6,002 mi
9,660 km · 5,216 nm
12h 14m
estimated nonstop flight time
+16h
time difference · heading northwest
See live ONT→OSN fares Phone-only fares on this route — call free
Flight time details
6,002 miles nonstop takes roughly 12h 14m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, 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 ONT
- CCB · Cable Airport6 mi away
- CNO · Chino Airport6 mi away
- LAX · Los Angeles International Airport47 mi away
- RAL · Riverside Municipal Airport11 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 ONT from OSN?
The flight distance from Ontario (ONT) to Osan (OSN) is 6,002 miles (9,660 km, 5,216 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to OSN?
A nonstop flight takes about 12h 14m 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 Ontario and Osan?
Osan is 16 hours ahead of Ontario.
What is the cheapest way to fly from ONT to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–OSN that never appear on search engines, with no booking fees.