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$466+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$625
(United Airlines)

One-way from

$466
(Kiwi.com)

Popular in

August

Cheapest in

May

Average price

$607
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. 15% potential increase in price ($144 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/12. 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 11/106:00 pmICN - ONT
2 stops35h 33mUnited Airlines
Fri 11/146:00 amONT - ICN
1 stop17h 15mUnited Airlines
Deal found 6/12$625
This Kissandfly.com deal was found by Cheapflights users on 6/10. 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.
Mon 6/164:50 pmICN - ONT
1 stop21h 55mLufthansa
Sun 6/296:10 amONT - ICN
1 stop16h 50mLufthansa
Deal found 6/10$801
This Gotogate deal was found by Cheapflights users on 6/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:35 pmICN - ONT
1 stop22h 05mChina Airlines
Wed 10/2212:10 amONT - ICN
1 stop27h 25mChina Airlines
Deal found 6/9$816
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:45 pmICN - ONT
2 stops18h 48mMultiple Airlines
Tue 9/236:50 pmONT - ICN
2 stops29h 15mMultiple Airlines
Deal found 6/10$910
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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.
Mon 9/19:25 pmICN - ONT
2 stops32h 44mAlaska Airlines
Fri 9/58:35 amONT - ICN
1 stop18h 25mAlaska Airlines
Deal found 6/9$961

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 June 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

Mon 11/10

6:00 pm-12:33 pm

2 stops35h 33m

Ontario

Fri 11/14

6:00 am-4:15 pm

1 stop17h 15m

$625

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 9/4

12:35 pm-6:40 pm

1 stop22h 05m

Ontario

Wed 10/22

12:10 am-7:35 pm

1 stop27h 25m

$816

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 9/16

5:45 pm-8:33 pm

2 stops18h 48m

Ontario

Tue 9/23

6:50 pm-4:05 pm

2 stops29h 15m

$910

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 9/1

9:25 pm-2:09 pm

2 stops32h 44m

Ontario

Fri 9/5

8:35 am-7:00 pm

1 stop18h 25m

$961

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 9/15

6:20 pm-11:40 pm

1 stop21h 20m

$466

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 7/3

12:35 pm-6:40 pm

1 stop22h 05m

$515

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 10/15

7:45 pm-11:59 pm

2 stops20h 14m

$655

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 9/10

11:30 am-8:43 pm

2 stops25h 13m

$679

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 9/5

9:25 pm-10:44 am

2 stops29h 19m

$721

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 12/4

6:50 pm-12:10 am

2 stops22h 20m

$743

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 15 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 June 12, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
Read reviews from past customers who have flown EVA Air, Korean Air and China Airlines from Seoul to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,202 reviews
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Korean Air
8.4
Very good
1,088 reviews
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
China Airlines
8.3
Very good
738 reviews
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Alaska Airlines
8.0
Very good
10,000 reviews
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Delta
8.0
Very good
7,950 reviews
EVA Air
8.4
Very good
1,202 reviews

Food

8.1

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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 $625, was found to be the cheapest airline from Incheon Intl Airport to Ontario.Alternate airlines to your destination round-trip include China Airlines and Alaska Airlines.

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

    To fly one-way, consider booking your trip with China Airlines, which is currently one of the cheapest options available, starting at $515. EVA Air flights start at $655 while deals on United Airlines start at $679 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$755FlexibilityNo cancel feeOn-time69%

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