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Ontario

$384+ 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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ONT
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$478
(United Airlines)

One-way from

$384
(Trip.com)

Popular in

January

Cheapest in

May

Average price

$790
From Seoul (SEL) to Ontario
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One-way flight from Seoul (SEL) to Ontario
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Highest demand for flights based on searches. 7% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This United Airlines deal was found by Cheapflights users on 7/30. 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.
Sun 8/314:50 pmICN - ONT
1 stop19h 43mUnited Airlines
Sun 9/76:38 pmONT - ICN
2 stops28h 22mUnited Airlines
Deal found 7/30$478
This Kissandfly.com deal was found by Cheapflights users on 7/31. 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 8/2511:30 amICN - ONT
1 stop22h 07mLufthansa
Sun 9/76:00 amONT - ICN
1 stop17h 00mLufthansa
Deal found 7/31$549
This Hawaiian Airlines deal was found by Cheapflights users on 7/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:35 pmICN - ONT
1 stop19h 28mHawaiian Airlines
Thu 10/27:47 pmONT - ICN
1 stop30h 48mHawaiian Airlines
Deal found 7/30$580
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/158:35 pmICN - ONT
1 stop17h 18mAlaska Airlines
Sat 2/76:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 7/30$592
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/177:20 pmICN - ONT
2 stops20h 22mDelta
Sun 9/286:00 amONT - ICN
1 stop17h 20mDelta
Deal found 7/30$634
This Hanatour deal was found by Cheapflights users on 7/31. 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 9/294:40 pmICN - ONT
1 stop22h 00mKorean Air
Mon 10/66:37 amONT - ICN
1 stop18h 03mKorean Air
Deal found 7/31$684
This flugladen.de deal was found by Cheapflights users on 7/31. 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 8/287:20 pmICN - ONT
1 stop15h 08mMultiple Airlines
Wed 9/103:06 pmONT - ICN
1 stop33h 34mMultiple Airlines
Deal found 7/31$700
This American Airlines deal was found by Cheapflights users on 7/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/255:25 pmICN - ONT
1 stop21h 23mAmerican Airlines
Sun 9/711:59 pmONT - ICN
1 stop23h 31mAmerican Airlines
Deal found 7/30$751
This Japan Airlines deal was found by Cheapflights users on 7/31. 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.
Thu 8/147:55 amGMP - ONT
2 stops30h 19mMultiple Airlines
Thu 8/2111:59 pmONT - GMP
2 stops29h 51mMultiple Airlines
Deal found 7/31$2,372

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 July 31, 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 8/31

4:50 pm-8:33 pm

1 stop19h 43m

Ontario

Sun 9/7

6:38 pm-3:00 pm

2 stops28h 22m

$478

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 8/25

11:30 am-5:37 pm

1 stop22h 07m

Ontario

Sun 9/7

6:00 am-3:00 pm

1 stop17h 00m

$549

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 9/25

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Thu 10/2

7:47 pm-6:35 pm

1 stop30h 48m

$580

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 11/15

8:35 pm-8:53 pm

1 stop17h 18m

Ontario

Sat 2/7

6:00 am-6:35 pm

1 stop19h 35m

$592

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 9/17

7:20 pm-11:42 pm

2 stops20h 22m

Ontario

Sun 9/28

6:00 am-3:20 pm

1 stop17h 20m

$634

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 9/29

4:40 pm-10:40 pm

1 stop22h 00m

Ontario

Mon 10/6

6:37 am-4:40 pm

1 stop18h 03m

$684

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 8/28

7:20 pm-6:28 pm

1 stop15h 08m

Ontario

Wed 9/10

3:06 pm-4:40 pm

1 stop33h 34m

$700

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 8/25

5:25 pm-10:48 pm

1 stop21h 23m

Ontario

Sun 9/7

11:59 pm-3:30 pm

1 stop23h 31m

$751

SeoulOntario

GMP - ONT

GMPONT

Seoul Gimpo Intl

Thu 8/14

7:55 am-10:14 pm

2 stops30h 19m

Ontario

Thu 8/21

11:59 pm-9:50 pm

2 stops29h 51m

$2,372

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 10/31

6:55 pm-11:40 pm

1 stop20h 45m

$384

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 19 results
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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, August is the cheapest month in which you can book a flight from Seoul to Ontario (average of $246). Flying from Seoul to Ontario in March is currently the most expensive (average of $328). 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 July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seoul to Ontario as you normally would.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 31, 2025.
Get a feel of what it's like to fly with EVA Air, Korean Air, and Japan Airlines from Seoul to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,220 reviews
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Korean Air
8.4
Very good
1,121 reviews
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Japan Airlines
8.3
Very good
1,536 reviews
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
China Airlines
8.3
Very good
754 reviews
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Alaska Airlines
8.0
Very good
10,000 reviews
EVA Air
8.4
Very good
1,220 reviews

Comfort

8.3

Overall

8.4

Boarding

8.4

Food

8.1

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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 1 airline.

  • What are the cheapest airlines to fly from Seoul to Ontario one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $396. Users have also found prices from $510 and $542 on China Airlines and Alaska Airlines, respectively.

  • 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, August is the cheapest month in which you can book a flight from Seoul to Ontario (average of $246). Flying from Seoul to Ontario in March is currently the most expensive (average of $328). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seoul to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Seoul to Ontario

Discover the top airline that operate flights from Seoul to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$755FlexibilityNo cancel feeOn-time69%

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