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$325+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
1 adult, Economy
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Find 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 October 27, 2025.

This Hanatour deal was found by Cheapflights users on 10/26. 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 Hanatour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/98:35 pmICN - ONT
1 stop31h 30mHawaiian Airlines
Thu 11/136:00 amONT - ICN
1 stop19h 35mHawaiian Airlines
Deal found 10/26$438
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/285:05 pmICN - ONT
1 stop16h 29mUnited Airlines
Sat 11/16:38 pmONT - ICN
1 stop18h 02mUnited Airlines
Deal found 10/27$504
This Kissandfly.com deal was found by Cheapflights users on 10/25. 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.
Mon 10/275:05 pmICN - ONT
1 stop21h 46mLufthansa
Sun 11/96:00 amONT - ICN
1 stop17h 15mLufthansa
Deal found 10/25$511
This Kissandfly.com deal was found by Cheapflights users on 10/26. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2711:55 amICN - ONT
1 stop16h 42mLufthansa
Fri 10/316:00 amONT - ICN
1 stop17h 10mLufthansa
Deal found 10/26$536
This Hanatour 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 Hanatour 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
Fri 1/26:00 amONT - ICN
1 stop19h 35mHawaiian Airlines
Deal found 10/27$562
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 12/1012:45 pmICN - ONT
1 stop16h 32mUnited Airlines
Thu 4/306:00 amONT - ICN
1 stop17h 00mUnited Airlines
Deal found 10/26$573
This United Airlines deal was found by Cheapflights users on 10/25. 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 12/912:45 pmICN - ONT
1 stop16h 32mUnited Airlines
Tue 3/106:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 10/25$574
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:05 pmICN - ONT
1 stop33h 56mDelta
Wed 11/125:49 pmONT - ICN
1 stop29h 41mDelta
Deal found 10/27$582
This Delta deal was found by Cheapflights users on 10/26. 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 12/258:05 pmICN - ONT
2 stops19h 28mDelta
Mon 1/57:30 amONT - ICN
1 stop16h 00mDelta
Deal found 10/26$583

Cheap 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 October 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$438
(Hanatour)

One-way from

$325
(Trip.com)

Popular in

October

Cheapest in

May

Average price

$856
Provider with most accurate pricing for Incheon Intl-Ontario flight deals.
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Provider most trusted by Cheapflights users for Incheon Intl-Ontario flights.
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From Incheon Intl to Ontario
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One-way flight from Incheon Intl to Ontario
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High demand for flights, 0% potential price rise
Search Deals
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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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 October 27, 2025.
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

Sun 1/25

12:45 pm-10:53 pm

1 stop27h 08m

Ontario

Thu 1/29

6:39 pm-5:40 am

1 stop18h 01m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 11/25

6:00 pm-10:51 pm

1 stop21h 51m

Ontario

Sat 11/29

6:00 am-5:40 am

1 stop30h 40m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 11/23

12:45 pm-5:34 pm

1 stop21h 49m

Ontario

Wed 11/26

6:00 am-4:15 pm

1 stop17h 15m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 2/6

12:45 pm-12:17 pm

1 stop16h 32m

Ontario

Sat 2/14

6:00 am-4:15 pm

1 stop17h 15m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 4/8

4:50 pm-6:00 pm

1 stop17h 10m

Ontario

Sat 4/11

1:00 pm-4:20 am

2 stops47h 20m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 2/8

12:45 pm-12:17 pm

1 stop16h 32m

Ontario

Sun 2/15

1:45 pm-5:40 am

2 stops22h 55m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/23

6:00 pm-5:41 pm

1 stop16h 41m

Ontario

Mon 3/2

6:37 pm-5:40 am

1 stop18h 03m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 3/18

11:45 am-12:17 pm

1 stop16h 32m

Ontario

Wed 4/22

6:30 pm-4:20 am

1 stop17h 50m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 11/20

6:00 pm-10:51 pm

1 stop21h 51m

Ontario

Sun 11/23

6:38 pm-4:15 pm

1 stop28h 37m

$504

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/7

12:45 pm-12:17 pm

1 stop16h 32m

Ontario

Sat 2/14

6:00 am-4:15 pm

1 stop17h 15m

$504

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 20 results
1
2
  • 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, February is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $404). Flying from Incheon Intl Airport 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 ICN to ONT?

Find hourly flight availability from Incheon Intl 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 27, 2025.

A simple way to save on the total cost of your ticket is to fly from Incheon Intl Airport to Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 33% on your trip compared to booking a flight in the evening.

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 $504, United Airlines can have you in Ontario from Incheon Intl Airport in 27h 08m. 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, February is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $404). Flying from Incheon Intl Airport 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.

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