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Ontario

$415+ 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 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/18. 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 12/256:00 pmICN - ONT
1 stop16h 51mUnited Airlines
Mon 12/296:39 pmONT - ICN
1 stop28h 36mUnited Airlines
Deal found 12/18$516
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/2212:45 pmICN - ONT
1 stop21h 58mUnited Airlines
Tue 12/306:00 amONT - ICN
1 stop30h 40mUnited Airlines
Deal found 12/17$517
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/226:00 pmICN - ONT
1 stop16h 43mUnited Airlines
Sat 1/310:42 amONT - ICN
1 stop36h 33mUnited Airlines
Deal found 12/16$518
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Sun 12/289:00 amICN - ONT
2 stops42h 01mUnited Airlines
Tue 1/66:32 pmONT - ICN
1 stop18h 08mUnited Airlines
Deal found 12/15$660
This flugladen.de deal was found by Cheapflights users on 12/16. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/188:35 pmICN - ONT
1 stop14h 50mHawaiian Airlines
Wed 12/316:00 amONT - ICN
1 stop19h 35mHawaiian Airlines
Deal found 12/16$662
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Sun 12/286:00 pmICN - ONT
1 stop33h 01mUnited Airlines
Tue 12/306:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 12/17$664
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/256:00 pmICN - ONT
2 stops20h 07mUnited Airlines
Sat 1/36:39 pmONT - ICN
1 stop28h 36mUnited Airlines
Deal found 12/16$665
This Delta deal was found by Cheapflights users on 12/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/188:05 pmICN - ONT
1 stop32h 08mDelta
Wed 12/316:38 amONT - ICN
1 stop16h 52mDelta
Deal found 12/17$669
This WhyPayMore deal was found by Cheapflights users on 12/17. 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 WhyPayMore is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:35 pmICN - ONT
1 stop20h 39mHawaiian Airlines
Sat 1/104:03 pmONT - ICN
1 stop33h 32mHawaiian Airlines
Deal found 12/17$671
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/2212:45 pmICN - ONT
1 stop14h 16mUnited Airlines
Wed 12/315:05 amONT - ICN
2 stops31h 35mUnited Airlines
Deal found 12/17$709
This Tourvis deal was found by Cheapflights users on 12/15. 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 Tourvis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:05 pmICN - ONT
1 stop14h 03mKorean Air
Wed 1/147:30 amONT - ICN
1 stop16h 00mKorean Air
Deal found 12/15$741
This Japan Airlines deal was found by Cheapflights users on 12/17. 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 Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2212:05 pmGMP - ONT
2 stops20h 37mJapan Airlines
Wed 12/316:00 amONT - GMP
2 stops23h 05mJapan Airlines
Deal found 12/17$1,572

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$517
(United Airlines)

One-way from

$415
(United Airlines)

Popular in

October

Cheapest in

November

Average price

$578
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. 3% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Sun 1/25

6:00 pm-10:53 pm

1 stop21h 53m

Ontario

Mon 2/2

1:53 pm-5:40 am

1 stop22h 47m

$524

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 1/21

6:00 pm-8:58 pm

2 stops19h 58m

Ontario

Thu 2/26

6:10 am-4:15 pm

1 stop17h 05m

$527

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 3/18

5:00 pm-5:41 pm

1 stop16h 41m

Ontario

Tue 3/31

6:53 pm-4:20 am

1 stop17h 27m

$543

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 4/16

11:30 am-9:55 am

1 stop14h 25m

Ontario

Fri 4/24

5:10 am-4:20 am

2 stops31h 10m

$543

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/21

12:45 pm-8:50 pm

2 stops25h 05m

Ontario

Sat 2/28

6:10 am-4:15 pm

1 stop17h 05m

$543

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 4/16

11:30 am-9:55 am

1 stop14h 25m

Ontario

Mon 4/27

6:53 pm-3:00 pm

1 stop28h 07m

$543

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/23

6:00 pm-10:57 pm

1 stop21h 57m

Ontario

Sat 2/28

1:53 pm-4:15 pm

1 stop33h 22m

$544

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 4/16

11:30 am-9:55 am

1 stop14h 25m

Ontario

Thu 4/23

1:33 pm-4:20 am

1 stop22h 47m

$544

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 4/21

11:30 am-12:20 pm

1 stop16h 50m

Ontario

Mon 5/4

6:00 am-3:00 pm

1 stop17h 00m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/10

6:00 pm-8:58 pm

2 stops19h 58m

Ontario

Tue 2/17

1:50 pm-5:40 am

1 stop22h 50m

$546

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 34 results
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Compare providers for flights from Seoul to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seoul to Ontario in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seoul-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seoul-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 January is currently the most expensive (average of $491). 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.

What is the cheapest time of day to fly from SEL to ONT?

Find hourly flight availability from Seoul to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

One of the essential ways to save on airfare from Seoul to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 33% on airfare.

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 $524, United Airlines can have you in Ontario from Seoul in 21h 53m. 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 January is currently the most expensive (average of $491). 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.

See more FAQs

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