$408 Cheap Flights from Seoul (ICN) to Ontario (ONT)

View $408 flight on Sun, Feb 1, 2026Opens in a new window

Popular airlines from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Seoul to Ontario (ICN-ONT)

Prices were available within the past 7 days and start at $408 for one-way flights and $494 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 3 - Tue, Nov 4
ICN
Seoul
ONT
Ontario
$494 Roundtrip, found 3 days ago
$494
Roundtrip
found 3 days ago
Select United flight, departing Mon, Nov 3 from Seoul to Ontario, returning Tue, Nov 4, priced at $494 found 3 days ago
United
Thu, Apr 9 - Sun, May 3
ICN
Seoul
ONT
Ontario
$498 Roundtrip, found 1 day ago
$498
Roundtrip
found 1 day ago
Select United flight, departing Thu, Apr 9 from Seoul to Ontario, returning Sun, May 3, priced at $498 found 1 day ago
United
Thu, Apr 9 - Sun, May 3
ICN
Seoul
ONT
Ontario
$503 Roundtrip, found 1 day ago
$503
Roundtrip
found 1 day ago
Select United flight, departing Thu, Apr 9 from Seoul to Ontario, returning Sun, May 3, priced at $503 found 1 day ago
United
Mon, Nov 3 - Tue, Nov 4
ICN
Seoul
ONT
Ontario
$505 Roundtrip, found 3 days ago
$505
Roundtrip
found 3 days ago
Select United flight, departing Mon, Nov 3 from Seoul to Ontario, returning Tue, Nov 4, priced at $505 found 3 days ago
United
Thu, Apr 9 - Sun, May 3
ICN
Seoul
ONT
Ontario
$509 Roundtrip, found 1 day ago
$509
Roundtrip
found 1 day ago
Select United flight, departing Thu, Apr 9 from Seoul to Ontario, returning Sun, May 3, priced at $509 found 1 day ago
United
Thu, Apr 9 - Sun, May 3
ICN
Seoul
ONT
Ontario
$510 Roundtrip, found 1 day ago
$510
Roundtrip
found 1 day ago
Select United flight, departing Thu, Apr 9 from Seoul to Ontario, returning Sun, May 3, priced at $510 found 1 day ago
Alaska Airlines
Thu, Mar 19 - Thu, Sep 17
ICN
Seoul
ONT
Ontario
$576 Roundtrip, found 4 days ago
$576
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 19 from Seoul to Ontario, returning Thu, Sep 17, priced at $576 found 4 days ago
Delta
Mon, Nov 3 - Mon, Nov 17
ICN
Seoul
ONT
Ontario
$591 Roundtrip, found 4 days ago
$591
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Nov 3 from Seoul to Ontario, returning Mon, Nov 17, priced at $591 found 4 days ago
Hawaiian Airlines
Sat, Feb 21 - Fri, Mar 6
ICN
Seoul
ONT
Ontario
$594 Roundtrip, found 3 days ago
$594
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Sat, Feb 21 from Seoul to Ontario, returning Fri, Mar 6, priced at $594 found 3 days ago
Korean Air
Thu, Mar 19 - Thu, Sep 17
ICN
Seoul
ONT
Ontario
$661 Roundtrip, found 4 days ago
$661
Roundtrip
found 4 days ago
Select Korean Air flight, departing Thu, Mar 19 from Seoul to Ontario, returning Thu, Sep 17, priced at $661 found 4 days ago

Frequently asked questions

How much does a flight from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Secure a cheap one-way flight from $408 or cheap return flight from $494 from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from ICN to ONT is November, when demand is low. Off-peak season is generally when better flight deals are available between these airports.
What is the cheapest airline that flies from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest ICN to ONT flight.
How many flights per day from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ICN to ONT?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on various factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)?
Opt for a flight from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) that takes off before 3 PM to reduce the risk of cancellations and delays. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from Incheon Intl. Airport (ICN)?
Los Angeles Intl. Airport (LAX) is the only airport in Ontario with direct flights from Incheon Intl. Airport (ICN). Check out the options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until just before your trip to book your flight from ICN to ONT generally means paying more. While it's possible to find some last-minute offers, there's no guarantee. Keep your travel schedule open for a better chance of getting a bargain.
Is it cheaper to book an ICN to ONT flight and hotel package?
Compared with arranging flights and hotels separately, booking an ICN to ONT flight and hotel package with Expedia could lead to significant savings. Better yet, managing everything in one place takes the hassle out of travel planning. Just pick your flights and select from our extensive range of stays, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT)?
Typically, you can reschedule or cancel your ICN to ONT flight. However, there may be additional charges, especially if you booked over 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like more details, go to our Customer Service portal.

Travel information

Origin airport
Incheon Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Air Canada, Alaska Airlines, American Airlines, China Airlines, Delta, Japan Airlines, Korean Air, United
Roundtrip price
$494
Distance
6009 mi

Book with confidence

Seoul to Ontario Flights

The cheapest times to fly from Seoul to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seoul to Ontario are during the month of November. You can find some of the cheapest flights from Seoul to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seoul to Ontario

Sunday is one of the best days to book for cheap flights from Seoul to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seoul to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seoul to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $408 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seoul to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seoul to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seoul to Ontario Flights

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*Available to One Key members.