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$364+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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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 July 29, 2025.

Round-trip from

$480
(United Airlines)

One-way from

$364
(Kiwi.com)

Popular in

January

Cheapest in

May

Average price

$790
From Incheon Intl to Ontario
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One-way flight from Incheon Intl 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 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 July 29, 2025.

This United Airlines deal was found by Cheapflights users on 7/29. 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 9/124:50 pmICN - ONT
1 stop16h 47mUnited Airlines
Tue 9/166:00 amONT - ICN
1 stop17h 00mUnited Airlines
Deal found 7/29$480
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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 stop30h 09mHawaiian Airlines
Thu 10/26:00 amONT - ICN
1 stop20h 35mHawaiian Airlines
Deal found 7/29$622
This Delta deal was found by Cheapflights users on 7/29. 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
Mon 9/296:00 amONT - ICN
1 stop18h 30mDelta
Deal found 7/29$636
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:35 pmICN - ONT
1 stop19h 28mAlaska Airlines
Fri 10/246:00 amONT - ICN
1 stop20h 35mAlaska Airlines
Deal found 7/27$637
This Korean Air deal was found by Cheapflights users on 7/29. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/184:40 pmICN - ONT
1 stop16h 20mKorean Air
Mon 9/296:00 amONT - ICN
1 stop18h 30mKorean Air
Deal found 7/29$704
This Kissandfly.com deal was found by Cheapflights users on 7/28. 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 8/227:20 pmICN - ONT
1 stop31h 30mMultiple Airlines
Thu 9/46:00 amONT - ICN
1 stop18h 30mMultiple Airlines
Deal found 7/28$746

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 July 29, 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

Fri 9/12

4:50 pm-5:37 pm

1 stop16h 47m

Ontario

Tue 9/16

6:00 am-3:00 pm

1 stop17h 00m

$480

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 9/25

8:35 pm-10:44 am

1 stop30h 09m

Ontario

Thu 10/2

6:00 am-6:35 pm

1 stop20h 35m

$622

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 9/17

7:40 pm-11:42 pm

1 stop20h 02m

Ontario

Thu 9/25

6:00 am-4:30 pm

1 stop18h 30m

$636

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 10/23

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Fri 10/24

6:00 am-6:35 pm

1 stop20h 35m

$637

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 9/18

4:40 pm-5:00 pm

1 stop16h 20m

Ontario

Mon 9/29

6:00 am-4:30 pm

1 stop18h 30m

$704

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 8/22

7:20 pm-10:50 am

1 stop31h 30m

Ontario

Thu 9/4

6:00 am-4:30 pm

1 stop18h 30m

$746

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 9/22

6:20 pm-8:56 pm

2 stops18h 36m

$364

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 8/25

11:30 am-12:13 pm

1 stop16h 43m

$391

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 9/25

12:35 pm-6:00 pm

1 stop21h 25m

$510

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 10/25

8:35 pm-12:03 am

1 stop19h 28m

$540

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 14 results
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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, August is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $246). Flying from Incheon Intl Airport 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 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 July 29, 2025.

A simple way to save on the total cost of your ticket is to fly from Incheon Intl Airport to Ontario at noon. If you’re flexible enough to do this you can expect to save up to 3% on your trip compared to booking a flight in the morning.

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 29, 2025.
See what other customers who have flown with Korean Air, China Airlines, and Alaska Airlines from Incheon Intl Airport to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Korean Air
8.4
Very good
1,121 reviews
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
China Airlines
8.3
Very good
754 reviews
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Alaska Airlines
8.0
Very good
10,000 reviews
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Delta
8.0
Very good
7,977 reviews
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Hawaiian Airlines
7.8
Good
2,605 reviews
Korean Air
8.4
Very good
1,121 reviews

Boarding

8.5

Entertainment

8.2

Comfort

8.2

Crew

8.7

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.

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 1 airline.

  • What are the cheapest airlines flying from Incheon Intl Airport to Ontario round-trip?

    United Airlines, at $480, was found to be the cheapest airline from Incheon Intl Airport to Ontario.Alternate airlines to your destination round-trip include Hawaiian Airlines and Delta.

  • What are the cheapest airlines to fly from Incheon Intl Airport to Ontario one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $391. China Airlines flights start at $510 while deals on Hawaiian Airlines start at $540 one-way.

  • 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, August is the cheapest month in which you can book a flight from Incheon Intl Airport to Ontario (average of $246). Flying from Incheon Intl Airport 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

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Top airline flying from Incheon Intl to Ontario

Discover the top airline that operate flights from Incheon Intl 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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$755FlexibilityNo cancel feeOn-time69%

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