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ICN to ONT: distance & flight time
Seoul (Incheon International Airport) → Ontario (Ontario International Airport)
6,009 mi
9,670 km · 5,221 nm
12h 15m
estimated nonstop flight time
-16h
time difference · heading northeast
See live ICN→ONT fares Phone-only fares on this route — call free
Flight time details
6,009 miles nonstop takes roughly 12h 15m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time set-back when reading arrival times on your ticket.
The two airports
- ICN — Incheon International Airport · Seoul, South Korea
- ONT — Ontario International Airport · Ontario, 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 ICN
- GMP · Gimpo International Airport20 mi away
- SWU · Suwon Airport34 mi away
- SSN · Seoul Air Base (K-16)36 mi away
- OSN · Osan Air Base41 mi away
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
Frequently asked questions
How far is ICN from ONT?
The flight distance from Seoul (ICN) to Ontario (ONT) is 6,009 miles (9,670 km, 5,221 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ICN to ONT?
A nonstop flight takes about 12h 15m 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 Seoul and Ontario?
Ontario is 16 hours behind Seoul.
What is the cheapest way to fly from ICN to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ICN–ONT that never appear on search engines, with no booking fees.