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Ontario

$324+ Cheap flights from Seoul (SEL) to Ontario (ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$337
(Hawaiian Airlines)

Popular in

October

Cheapest in

May

Average price

$582
From Seoul (SEL) to Ontario
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/148:35 pmICN - ONT
1 stop30h 09mHawaiian Airlines
Sat 9/273:06 pmONT - ICN
1 stop35h 29mHawaiian Airlines
Deal found 9/13$324
This Trip.com deal was found by Cheapflights users on 9/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/198:35 pmICN - ONT
1 stop19h 28mHawaiian Airlines
Thu 10/26:00 amONT - ICN
1 stop20h 35mHawaiian Airlines
Deal found 9/13$325
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:35 pmICN - ONT
1 stop19h 28mHawaiian Airlines
Fri 9/2610:09 amONT - ICN
1 stop16h 51mHawaiian Airlines
Deal found 9/15$337
This Hawaiian Airlines deal was found by Cheapflights users on 9/13. 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.
Fri 10/178:35 pmICN - ONT
1 stop19h 28mHawaiian Airlines
Fri 10/319:45 amONT - ICN
1 stop17h 40mHawaiian Airlines
Deal found 9/13$338
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:35 pmICN - ONT
1 stop19h 28mAlaska Airlines
Fri 9/2610:09 amONT - ICN
1 stop16h 51mAlaska Airlines
Deal found 9/15$347
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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.
Thu 9/188:35 pmICN - ONT
1 stop19h 28mAlaska Airlines
Sat 9/273:06 pmONT - ICN
1 stop35h 29mAlaska Airlines
Deal found 9/13$359
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/89:25 pmICN - ONT
1 stop36h 49mAlaska Airlines
Sat 11/1511:59 amONT - ICN
1 stop37h 36mAlaska Airlines
Deal found 9/15$369
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 11/38:35 pmICN - ONT
2 stops20h 21mAlaska Airlines
Thu 2/266:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 9/13$461
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/208:35 pmICN - ONT
1 stop19h 28mAlaska Airlines
Mon 10/276:11 pmONT - ICN
2 stops33h 14mAlaska Airlines
Deal found 9/13$463
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/89:25 pmICN - ONT
2 stops42h 26mAlaska Airlines
Sat 10/186:00 amONT - ICN
1 stop20h 35mAlaska Airlines
Deal found 9/15$475
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 11/39:25 pmICN - ONT
1 stop36h 49mAlaska Airlines
Thu 11/137:20 amONT - ICN
2 stops43h 05mAlaska Airlines
Deal found 9/13$497
This Mytrip deal was found by Cheapflights users on 9/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:15 amGMP - ONT
2 stops27h 25mMultiple Airlines
Fri 9/2612:10 amONT - GMP
2 stops22h 50mMultiple Airlines
Deal found 9/13$1,065

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 September 15, 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 10/26

8:35 pm-11:32 pm

1 stop18h 57m

Ontario

Thu 1/15

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 10/23

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Sat 1/17

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 10/25

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Sun 1/11

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 10/26

8:35 pm-8:53 pm

1 stop16h 18m

Ontario

Sat 1/17

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 10/17

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Sun 2/1

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 10/8

9:25 pm-11:51 pm

2 stops42h 26m

Ontario

Sat 10/18

6:00 am-6:35 pm

1 stop20h 35m

$475

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 10/30

11:55 am-12:37 pm

1 stop16h 42m

Ontario

Mon 11/3

6:38 pm-5:40 am

1 stop18h 02m

$517

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 10/14

11:30 am-5:40 pm

1 stop22h 10m

Ontario

Mon 10/20

9:36 am-3:00 pm

1 stop37h 24m

$517

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/5

12:45 pm-5:43 pm

1 stop21h 58m

Ontario

Thu 2/12

6:37 pm-5:40 am

1 stop18h 03m

$517

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/26

12:45 pm-12:18 pm

1 stop16h 33m

Ontario

Sun 3/1

6:37 pm-5:40 am

1 stop18h 03m

$517

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 30 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 September 15, 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 September 15, 2025.
Get a feel of what it's like to fly with United 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.
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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.

  • How long is the flight from Seoul to Ontario?

    For as low as $347, Alaska Airlines can have you in Ontario from Seoul in 18h 57m. 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, 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$702FlexibilityNo cancel feeOn-time69%

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