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$417+ 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 12/26. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/10. 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 12/136:00 pmICN - ONT
1 stop21h 49mUnited Airlines
Wed 1/71:53 pmONT - ICN
1 stop22h 47mUnited Airlines
Deal found 12/10$518
This United Airlines deal was found by Cheapflights users on 12/11. 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 12/1212:45 pmICN - ONT
1 stop21h 52mUnited Airlines
Sat 1/106:00 amONT - ICN
2 stops36h 35mUnited Airlines
Deal found 12/11$661
This Kissandfly.com deal was found by Cheapflights users on 12/10. 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 12/1212:45 pmICN - ONT
1 stop16h 33mLufthansa
Sun 12/286:39 pmONT - ICN
1 stop18h 01mLufthansa
Deal found 12/10$663
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/2812:45 pmICN - ONT
1 stop14h 16mUnited Airlines
Sun 1/115:05 amONT - ICN
2 stops31h 35mUnited Airlines
Deal found 12/9$665
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/2412:45 pmICN - ONT
1 stop14h 16mUnited Airlines
Tue 1/206:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 12/9$666
This Delta deal was found by Cheapflights users on 12/10. 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
1 stop14h 03mDelta
Mon 5/47:00 amONT - ICN
1 stop17h 30mDelta
Deal found 12/10$668
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 12/188:35 pmICN - ONT
1 stop20h 39mAlaska Airlines
Wed 12/316:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 12/9$692
This Alaska Airlines deal was found by Cheapflights users on 12/10. 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 12/258:35 pmICN - ONT
1 stop20h 39mMultiple Airlines
Thu 5/76:00 amONT - ICN
1 stop20h 35mMultiple Airlines
Deal found 12/10$695
This Delta deal was found by Cheapflights users on 12/10. 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.
Sat 12/278:05 pmICN - ONT
1 stop14h 03mDelta
Thu 2/126:00 amONT - ICN
1 stop17h 20mDelta
Deal found 12/10$719
This WhyPayMore deal was found by Cheapflights users on 12/11. 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 WhyPayMore is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/254:10 pmICN - ONT
1 stop17h 58mKorean Air
Mon 1/196:00 amONT - ICN
1 stop17h 20mKorean Air
Deal found 12/11$722
This Delta deal was found by Cheapflights users on 12/10. 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 12/254:10 pmICN - ONT
2 stops23h 23mDelta
Thu 5/77:00 amONT - ICN
1 stop17h 40mDelta
Deal found 12/10$736
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 12/188:35 pmICN - ONT
1 stop20h 39mAlaska Airlines
Fri 1/26:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 12/9$743

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$518
(United Airlines)

One-way from

$417
(United Airlines)

Popular in

October

Cheapest in

November

Average price

$582
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. 2% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 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

Thu 1/15

6:00 pm-10:53 pm

1 stop21h 53m

Ontario

Mon 1/26

1:24 pm-5:40 am

2 stops47h 16m

$526

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 1/25

6:00 pm-12:47 pm

2 stops35h 47m

Ontario

Sun 2/1

6:00 am-4:15 pm

1 stop17h 15m

$526

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 1/16

6:00 pm-12:47 pm

2 stops35h 47m

Ontario

Mon 1/26

6:00 am-4:15 pm

1 stop17h 15m

$527

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/26

6:00 pm-5:41 pm

1 stop16h 41m

Ontario

Wed 3/4

6:09 am-4:15 pm

1 stop17h 06m

$545

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/28

12:45 pm-12:43 pm

2 stops40h 58m

Ontario

Sun 3/8

5:15 am-3:15 pm

2 stops42h 00m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/2

12:45 pm-11:18 am

1 stop15h 33m

Ontario

Sat 2/21

1:45 pm-4:15 pm

2 stops33h 30m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 2/18

12:45 pm-12:48 pm

1 stop17h 03m

Ontario

Mon 2/23

6:10 am-4:15 pm

1 stop17h 05m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/19

12:45 pm-12:38 pm

1 stop16h 53m

Ontario

Mon 2/23

6:10 am-4:15 pm

1 stop17h 05m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 2/9

12:45 pm-11:18 am

1 stop15h 33m

Ontario

Fri 2/13

6:10 am-4:15 pm

1 stop17h 05m

$546

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 3/11

5:00 pm-8:50 pm

2 stops19h 50m

Ontario

Sun 3/15

6:00 am-3:15 pm

1 stop17h 15m

$546

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 22 results
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Compare providers for flights from Incheon Intl 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 Incheon Intl to Ontario in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*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 Incheon Intl Airport-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Incheon Intl Airport-Ontario flight deals on Cheapflights vs. eDreams >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 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 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 January is currently the most expensive (average of $495). 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 December 12, 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 $526, United Airlines can have you in Ontario from Incheon Intl Airport in 21h 53m. 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 January is currently the most expensive (average of $495). 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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