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$391+ Cheap flights from Seoul (SEL) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ONT
Mar 9 — Mar 161
Mon 3/9
Mon 3/16
1 adult, Economy
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Cheap flight deals from Seoul to Ontario

Cheapest flights from Seoul to Ontario
Explore the most affordable flight options available from Seoul to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 7, 2026.

This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1212:45 pm
ICN
-
ONT
1 stop16h 53m
United Airlines
Sat 2/141:45 pm
ONT
-
ICN
2 stops33h 30m
United Airlines
Deal found 2/5$509
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:00 pm
ICN
-
ONT
1 stop16h 41m
United Airlines
Mon 3/26:10 am
ONT
-
ICN
1 stop17h 05m
United Airlines
Deal found 2/6$510
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/912:45 pm
ICN
-
ONT
1 stop27h 08m
United Airlines
Fri 2/139:08 pm
ONT
-
ICN
1 stop26h 07m
United Airlines
Deal found 2/5$512
This Kissandfly.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/166:00 pm
ICN
-
ONT
1 stop18h 54m
Lufthansa
Wed 3/46:09 am
ONT
-
ICN
1 stop17h 06m
Lufthansa
Deal found 2/7$514
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/166:00 pm
ICN
-
ONT
1 stop16h 41m
United Airlines
Tue 2/241:45 pm
ONT
-
ICN
2 stops33h 30m
United Airlines
Deal found 2/4$515
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:50 pm
ICN
-
ONT
1 stop21h 44m
United Airlines
Sun 9/205:00 am
ONT
-
ICN
2 stops42h 00m
United Airlines
Deal found 2/7$578
This Hanatour deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hanatour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/268:35 pm
ICN
-
ONT
1 stop19h 57m
Hawaiian Airlines
Sat 2/284:02 pm
ONT
-
ICN
1 stop33h 33m
Hawaiian Airlines
Deal found 2/5$581
This Hanatour deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hanatour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:35 pm
ICN
-
ONT
1 stop19h 57m
Hawaiian Airlines
Thu 2/266:14 am
ONT
-
ICN
1 stop19h 21m
Hawaiian Airlines
Deal found 2/4$584
This Alaska Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:35 pm
ICN
-
ONT
1 stop19h 57m
Multiple Airlines
Sat 2/284:02 pm
ONT
-
ICN
1 stop33h 33m
Multiple Airlines
Deal found 2/4$598
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/257:35 pm
ICN
-
ONT
1 stop20h 23m
Alaska Airlines
Mon 9/216:00 am
ONT
-
ICN
1 stop19h 30m
Alaska Airlines
Deal found 2/7$601
This Booking.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:40 am
GMP
-
ONT
3 stops26h 01m
Multiple Airlines
Wed 2/256:09 am
ONT
-
GMP
3 stops23h 21m
Multiple Airlines
Deal found 2/3$4,075

Find flight deals from Seoul to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Seoul (SEL) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$509
(United Airlines)

One-way from

$391
(Kiwi.com)

Popular in

October

Cheapest in

November

Average price

$654
Provider with most accurate pricing for Seoul (SEL)-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seoul (SEL)-Ontario flights.
Search Deals
From Seoul (SEL) to Ontario
Search Deals
One-way flight from Seoul (SEL) to Ontario
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($4 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seoul to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 7, 2026.
Use the filters below to find and compare flights from Seoul to Ontario that are best for you.

Fly from

Seoul

Fly to

Ontario

Route

Depart

Return

Price

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 3/17

5:00 pm-5:41 pm

1 stop16h 41m

Ontario

Sun 4/19

6:49 pm-4:20 am

1 stop17h 31m

$509

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 3/1

12:45 pm-12:38 pm

1 stop16h 53m

Ontario

Wed 3/11

6:15 am-3:15 pm

1 stop17h 00m

$510

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/28

6:00 pm-5:41 pm

1 stop16h 41m

Ontario

Mon 3/2

6:10 am-4:15 pm

1 stop17h 05m

$510

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 3/4

12:45 pm-12:48 pm

1 stop17h 03m

Ontario

Tue 3/17

6:37 pm-4:40 am

1 stop18h 03m

$512

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/17

12:45 pm-9:58 am

1 stop14h 13m

Ontario

Thu 2/19

6:10 am-4:15 pm

1 stop17h 05m

$515

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/19

12:45 pm-12:38 pm

1 stop16h 53m

Ontario

Thu 2/26

6:10 am-4:15 pm

1 stop17h 05m

$515

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 5/28

4:50 pm-10:34 pm

1 stop21h 44m

Ontario

Tue 9/22

6:00 am-3:00 pm

1 stop17h 00m

$578

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/23

8:35 pm-11:32 pm

1 stop19h 57m

Ontario

Sat 2/28

4:02 pm-6:35 pm

1 stop33h 33m

$640

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 5/27

7:35 pm-11:58 pm

1 stop20h 23m

Ontario

Fri 9/25

6:00 am-5:30 pm

1 stop19h 30m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 3/10

5:00 pm-5:41 pm

1 stop16h 41m

Ontario

Tue 3/31

6:00 am-3:00 pm

1 stop17h 00m

$650

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 36 results
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  • Most accurate provider: When it comes to deals on Seoul-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seoul-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seoul-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seoul-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seoul-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seoul to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Seoul with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seoul to Ontario

What is the cheapest month to book a flight from Seoul to Ontario?

Currently, October is the cheapest month in which you can book a flight from Seoul to Ontario (average of $397). Flying from Seoul to Ontario in August is currently the most expensive (average of $457). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Seoul to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Seoul?

    If you book a flight to Ontario from Seoul, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Seoul to Ontario per day from 0 different airlines.

  • How long is the flight from Seoul to Ontario?

    For as low as $509, United Airlines can have you in Ontario from Seoul in 16h 41m. There are 6006 mi between Seoul and Ontario.

  • Can I find deals for flights from Seoul to Ontario that include hotel bookings?

    Yes. In addition to deals on Seoul to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seoul to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seoul to Ontario.

  • Can I find deals for business class flights from Seoul to Ontario?

    Yes. Cheapflights offers flight deals from Seoul to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seoul to Ontario?

    Currently, October is the cheapest month in which you can book a flight from Seoul to Ontario (average of $397). Flying from Seoul to Ontario in August is currently the most expensive (average of $457). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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