$590 Cheap Flights from Seoul (ICN) to Ontario (ONT)

View $590 flight on Mon, May 12, 2025Opens in a new window

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

Find available prices by choosing your travel dates.

Cheap Flights from Seoul to Ontario (ICN-ONT)

Prices were available within the past 7 days and start at $590 for one-way flights and $503 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, May 4 - Sun, May 11
ICN
Seoul
ONT
Ontario
$503 Roundtrip, found 3 days ago
$503
Roundtrip
found 3 days ago
Select United flight, departing Sun, May 4 from Seoul to Ontario, returning Sun, May 11, priced at $503 found 3 days ago
United
Sun, May 4 - Sun, May 11
ICN
Seoul
ONT
Ontario
$508 Roundtrip, found 3 days ago
$508
Roundtrip
found 3 days ago
Select United flight, departing Sun, May 4 from Seoul to Ontario, returning Sun, May 11, priced at $508 found 3 days ago
United
Thu, May 22 - Sun, Jul 13
ICN
Seoul
ONT
Ontario
$526 Roundtrip, found 2 hours ago
$526
Roundtrip
found 2 hours ago
Select United flight, departing Thu, May 22 from Seoul to Ontario, returning Sun, Jul 13, priced at $526 found 2 hours ago
United
Wed, May 14 - Sat, Jul 5
ICN
Seoul
ONT
Ontario
$527 Roundtrip, found 2 days ago
$527
Roundtrip
found 2 days ago
Select United flight, departing Wed, May 14 from Seoul to Ontario, returning Sat, Jul 5, priced at $527 found 2 days ago
United
Thu, May 29 - Sat, Jun 28
ICN
Seoul
ONT
Ontario
$532 Roundtrip, found 5 days ago
$532
Roundtrip
found 5 days ago
Select United flight, departing Thu, May 29 from Seoul to Ontario, returning Sat, Jun 28, priced at $532 found 5 days ago
United
Sun, May 11 - Mon, May 12
ICN
Seoul
ONT
Ontario
$533 Roundtrip, found 6 days ago
$533
Roundtrip
found 6 days ago
Select United flight, departing Sun, May 11 from Seoul to Ontario, returning Mon, May 12, priced at $533 found 6 days ago
Jeju Air
Fri, May 2 - Sun, May 11
ICN
Seoul
ONT
Ontario
$643 Roundtrip, found 6 days ago
$643
Roundtrip
found 6 days ago
Select Jeju Air flight, departing Fri, May 2 from Seoul to Ontario, returning Sun, May 11, priced at $643 found 6 days ago
Alaska Airlines
Mon, May 5 - Tue, May 20
ICN
Seoul
ONT
Ontario
$866 Roundtrip, found 15 hours ago
$866
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Mon, May 5 from Seoul to Ontario, returning Tue, May 20, priced at $866 found 15 hours ago
Hawaiian Airlines
Fri, May 9 - Tue, May 27
ICN
Seoul
ONT
Ontario
$866 Roundtrip, found 15 hours ago
$866
Roundtrip
found 15 hours ago
Select Hawaiian Airlines flight, departing Fri, May 9 from Seoul to Ontario, returning Tue, May 27, priced at $866 found 15 hours ago
China Airlines
Sat, Jun 28 - Tue, Jul 22
ICN
Seoul
ONT
Ontario
$1,009 Roundtrip, found 1 hour ago
$1,009
Roundtrip
found 1 hour ago
Select China Airlines flight, departing Sat, Jun 28 from Seoul to Ontario, returning Tue, Jul 22, priced at $1,009 found 1 hour ago
Flights from Seoul (ICN) to Ontario (ONT)
Origin airport
Incheon Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Air Canada, Alaska Airlines, American Airlines, China Airlines, Delta, Hawaiian Airlines, Japan Airlines, Korean Air, United
Roundtrip price
$502
Distance
6009 mi

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 May. 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 $590 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.

Frequently asked questions

How much does a flight from Incheon Intl. Airport (ICN) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from ICN to ONT by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ICN to ONT?
The cheapest flights from ICN to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from ICN to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ICN to ONT. Sort your results by “Price (lowest to highest)” to snap up a great deal.
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.

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*Available to One Key members.