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Ontario

$397+ Cheap flights from Incheon Intl (ICN) 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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Incheon Intl to Ontario

Cheapest flights from Incheon Intl to Ontario
Explore the most affordable flight options available from Incheon Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This United Airlines deal was found by Cheapflights users on 1/26. 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 2/212:45 pm
ICN
-
ONT
1 stop15h 33m
United Airlines
Tue 2/35:05 am
ONT
-
ICN
2 stops31h 35m
United Airlines
Deal found 1/26$535
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/16:00 pm
ICN
-
ONT
1 stop16h 43m
United Airlines
Sun 3/86:15 am
ONT
-
ICN
1 stop17h 00m
United Airlines
Deal found 1/26$536
This United Airlines deal was found by Cheapflights users on 1/25. 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 1/266:00 pm
ICN
-
ONT
2 stops35h 47m
United Airlines
Fri 1/301:24 pm
ONT
-
ICN
2 stops33h 51m
United Airlines
Deal found 1/25$542
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/36:00 pm
ICN
-
ONT
2 stops19h 58m
United Airlines
Wed 2/111:24 pm
ONT
-
ICN
2 stops33h 51m
United Airlines
Deal found 1/26$554
This United Airlines deal was found by Cheapflights users on 1/25. 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 3/1711:45 am
ICN
-
ONT
1 stop16h 33m
United Airlines
Sun 4/195:10 am
ONT
-
ICN
2 stops31h 10m
United Airlines
Deal found 1/25$556
This Kissandfly.com deal was found by Cheapflights users on 1/25. 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 1/2912:45 pm
ICN
-
ONT
1 stop21h 58m
Lufthansa
Wed 2/111:53 pm
ONT
-
ICN
1 stop33h 22m
Lufthansa
Deal found 1/25$607
This Hanatour deal was found by Cheapflights users on 1/25. 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 3/168:35 pm
ICN
-
ONT
1 stop18h 57m
Hawaiian Airlines
Sun 3/226:00 am
ONT
-
ICN
1 stop20h 35m
Hawaiian Airlines
Deal found 1/25$630
This Alaska Airlines deal was found by Cheapflights users on 1/25. 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 3/78:35 pm
ICN
-
ONT
1 stop19h 57m
Multiple Airlines
Wed 4/296:00 am
ONT
-
ICN
1 stop19h 30m
Multiple Airlines
Deal found 1/25$637
This Delta deal was found by Cheapflights users on 1/26. 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 1/298:05 pm
ICN
-
ONT
1 stop34h 51m
Delta
Wed 2/115:10 pm
ONT
-
ICN
1 stop30h 10m
Delta
Deal found 1/26$643
This modetour deal was found by Cheapflights users on 1/25. 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 modetour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/277:35 pm
ICN
-
ONT
1 stop30h 10m
Alaska Airlines
Sat 5/23:26 pm
ONT
-
ICN
1 stop34h 04m
Alaska Airlines
Deal found 1/25$644
This Delta deal was found by Cheapflights users on 1/25. 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.
Tue 3/108:05 pm
ICN
-
ONT
2 stops19h 46m
Delta
Sun 4/267:00 am
ONT
-
ICN
1 stop17h 50m
Delta
Deal found 1/25$645
This BusinessClass deal was found by Cheapflights users on 1/25. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/98:35 pm
ICN
-
ONT
1 stop20h 21m
Multiple Airlines
Fri 2/134:02 pm
ONT
-
ICN
1 stop33h 33m
Multiple Airlines
Deal found 1/25$654

Find flight deals from Incheon Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Incheon Intl (ICN) 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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$528
(United Airlines)

One-way from

$397
(Vliegwinkel)

Popular in

October

Cheapest in

November

Average price

$662
Provider with most accurate pricing for Incheon Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Incheon Intl-Ontario flights.
Search Deals
From Incheon Intl to Ontario
Search Deals
One-way flight from Incheon Intl 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 ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Incheon Intl 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 January 26, 2026.
Use the filters below to find and compare flights from Incheon Intl Airport to Ontario that are best for you.

Fly from

Incheon Intl

Fly to

Ontario

Route

Depart

Return

Price

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 2/20

12:45 pm-5:41 pm

1 stop21h 56m

Ontario

Sun 3/1

1:50 pm-4:15 pm

1 stop33h 25m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/19

12:45 pm-10:57 pm

1 stop27h 12m

Ontario

Tue 2/24

6:10 am-4:15 pm

1 stop17h 05m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 2/18

12:45 pm-12:48 pm

1 stop17h 03m

Ontario

Wed 2/25

1:50 pm-4:15 pm

1 stop33h 25m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 3/10

11:45 am-12:18 pm

1 stop16h 33m

Ontario

Thu 4/16

6:49 pm-4:20 am

1 stop17h 31m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/16

6:00 pm-10:57 pm

1 stop21h 57m

Ontario

Mon 2/23

9:06 pm-4:15 pm

1 stop26h 09m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/10

12:45 pm-5:43 pm

1 stop21h 58m

Ontario

Mon 2/23

9:06 pm-4:15 pm

1 stop26h 09m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 2/8

12:45 pm-8:58 pm

2 stops25h 13m

Ontario

Thu 2/12

6:10 am-4:15 pm

1 stop17h 05m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/16

6:00 pm-9:58 am

1 stop32h 58m

Ontario

Thu 2/26

6:10 am-4:15 pm

1 stop17h 05m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 2/8

12:45 pm-8:58 pm

2 stops25h 13m

Ontario

Sat 2/14

5:00 am-5:40 am

2 stops31h 40m

$536

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/24

6:00 pm-5:41 pm

1 stop16h 41m

Ontario

Tue 3/3

6:10 am-4:15 pm

1 stop17h 05m

$536

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 21 results
1
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  • Most accurate provider: When it comes to deals on Incheon Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Incheon Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Incheon Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Incheon Intl Airport-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 Incheon Intl Airport-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 Incheon Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Incheon Intl 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 Incheon Intl Airport to Ontario

What is the cheapest month to book a flight from Incheon Intl Airport to Ontario?

Currently, October is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $397). Flying from Incheon Intl Airport to Ontario in August is currently the most expensive (average of $450). 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 Incheon Intl 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 Incheon Intl?

    If you book a flight to Ontario from Incheon Intl, 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 Incheon Intl to Ontario per day from 0 different airlines.

  • How long is the flight from Incheon Intl Airport to Ontario?

    For as low as $536, United Airlines can have you in Ontario from Incheon Intl Airport in 21h 56m. Airlines will cover a distance of 6006 mi.

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

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

  • How can I find direct flights from Incheon Intl to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Incheon Intl 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 Incheon Intl Airport to Ontario?

    Currently, October is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $397). Flying from Incheon Intl Airport to Ontario in August is currently the most expensive (average of $450). 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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