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ONT to SSN: distance & flight time
Ontario (Ontario International Airport) → Seoul East (Seoul Air Base (K-16))
5,983 mi
9,628 km · 5,199 nm
12h 12m
estimated nonstop flight time
+16h
time difference · heading northwest
See live ONT→SSN fares Phone-only fares on this route — call free
Flight time details
5,983 miles nonstop takes roughly 12h 12m 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
- SSN — Seoul Air Base (K-16) · Seoul East, 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 SSN
- ICN · Incheon International Airport36 mi away
- SWU · Suwon Airport15 mi away
- GMP · Gimpo International Airport19 mi away
- OSN · Osan Air Base25 mi away
Frequently asked questions
How far is ONT from SSN?
The flight distance from Ontario (ONT) to Seoul East (SSN) is 5,983 miles (9,628 km, 5,199 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to SSN?
A nonstop flight takes about 12h 12m 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 ONT to SSN?
Nonstop service on ONT–SSN 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 12h 12m nonstop estimate.
What is the time difference between Ontario and Seoul East?
Seoul East is 16 hours ahead of Ontario.
What is the cheapest way to fly from ONT to SSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–SSN that never appear on search engines, with no booking fees.
Why are some ONT to SSN fares phone-only?
Consolidator contracts let us sell certain ONT–SSN 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.