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Ontario

$339+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$440
(Hanatour)

One-way from

$339
(Trip.com)

Popular in

October

Cheapest in

May

Average price

$856
Provider with most accurate pricing for Seoul (SEL)-Ontario flight deals.
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Provider most trusted by Cheapflights users for Seoul (SEL)-Ontario flights.
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From Seoul (SEL) to Ontario
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One-way flight from Seoul (SEL) to Ontario
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 30, 2025.

This Hanatour deal was found by Cheapflights users on 10/29. 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.
Mon 11/38:35 pmICN - ONT
1 stop35h 42mHawaiian Airlines
Sun 3/16:00 amONT - ICN
1 stop19h 35mHawaiian Airlines
Deal found 10/29$441
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/15:05 pmICN - ONT
2 stops36h 28mUnited Airlines
Mon 11/35:05 amONT - ICN
2 stops31h 35mUnited Airlines
Deal found 10/29$506
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/1512:45 pmICN - ONT
1 stop16h 32mUnited Airlines
Sun 1/186:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 10/30$507
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/36:00 pmICN - ONT
2 stops19h 44mUnited Airlines
Sun 11/96:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 10/30$508
This Kissandfly.com deal was found by Cheapflights users on 10/27. 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.
Thu 10/3011:55 amICN - ONT
1 stop16h 42mLufthansa
Wed 11/126:00 amONT - ICN
1 stop17h 15mLufthansa
Deal found 10/27$524
This Kissandfly.com deal was found by Cheapflights users on 10/29. 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.
Fri 10/315:05 pmICN - ONT
1 stop21h 46mLufthansa
Thu 11/136:00 amONT - ICN
1 stop17h 15mLufthansa
Deal found 10/29$526
This Kissandfly.com deal was found by Cheapflights users on 10/30. 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 11/36:00 pmICN - ONT
1 stop16h 34mLufthansa
Sun 11/166:38 pmONT - ICN
1 stop18h 02mLufthansa
Deal found 10/30$529
This Hanatour deal was found by Cheapflights users on 10/29. 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.
Fri 12/198:35 pmICN - ONT
1 stop20h 39mHawaiian Airlines
Wed 1/2111:53 amONT - ICN
1 stop37h 42mHawaiian Airlines
Deal found 10/29$564
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/36:00 pmICN - ONT
2 stops35h 31mUnited Airlines
Sun 3/11:45 pmONT - ICN
1 stop33h 30mUnited Airlines
Deal found 10/28$575
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Fri 10/3111:55 amICN - ONT
2 stops24h 49mUnited Airlines
Tue 11/46:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 10/30$578
This Delta deal was found by Cheapflights users on 10/28. 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 10/308:05 pmICN - ONT
1 stop18h 36mDelta
Wed 11/1211:48 amONT - ICN
1 stop35h 42mDelta
Deal found 10/28$583
This Jetabroad deal was found by Cheapflights users on 10/29. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/278:00 amGMP - ONT
2 stops24h 54mJapan Airlines
Thu 12/46:00 amONT - GMP
2 stops23h 05mJapan Airlines
Deal found 10/29$2,297

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 October 30, 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

Mon 3/16

11:45 am-12:17 pm

1 stop16h 32m

Ontario

Sat 3/21

7:15 pm-3:15 pm

1 stop28h 00m

$506

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 12/10

6:00 pm-5:37 pm

1 stop16h 37m

Ontario

Wed 1/21

6:00 am-4:15 pm

1 stop17h 15m

$506

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 1/24

12:45 pm-12:17 pm

1 stop16h 32m

Ontario

Mon 2/2

1:53 pm-5:40 am

1 stop22h 47m

$506

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 1/22

6:00 pm-5:43 pm

1 stop16h 43m

Ontario

Fri 2/27

6:00 am-4:15 pm

1 stop17h 15m

$506

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 1/23

12:45 pm-12:17 pm

1 stop16h 32m

Ontario

Sat 2/21

1:53 pm-5:40 am

1 stop22h 47m

$508

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 1/22

6:00 pm-5:43 pm

1 stop16h 43m

Ontario

Sat 2/21

1:53 pm-5:40 am

1 stop22h 47m

$508

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 1/16

6:00 pm-12:17 pm

1 stop35h 17m

Ontario

Tue 2/3

5:05 am-5:40 am

2 stops31h 35m

$578

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/5

8:05 pm-11:58 pm

2 stops44h 53m

Ontario

Fri 2/13

5:05 pm-4:30 pm

2 stops54h 25m

$585

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/3

8:05 pm-4:13 pm

2 stops37h 08m

Ontario

Fri 2/13

5:05 pm-4:30 pm

2 stops54h 25m

$585

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 2/11

8:05 pm-10:29 pm

1 stop19h 24m

Ontario

Sun 2/22

6:45 am-4:30 pm

1 stop16h 45m

$586

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 33 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 October.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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, February is the cheapest month in which you can book a flight from Seoul to Ontario (average of $404). Flying from Seoul to Ontario in January is currently the most expensive (average of $548). 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 October 30, 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 $506, United Airlines can have you in Ontario from Seoul in 16h 32m. 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, February is the cheapest month in which you can book a flight from Seoul to Ontario (average of $404). Flying from Seoul to Ontario in January is currently the most expensive (average of $548). 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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