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$443+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
May 26 — Jun 21
Mon 5/26
Mon 6/2
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 May 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$595
(United Airlines)

One-way from

$443
(Kiwi.com)

Popular in

August

Cheapest in

April

Average price

$734
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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Highest demand for flights based on searches. 24% potential increase in price ($248 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($55 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 21, 2025.

This United Airlines deal was found by Cheapflights users on 5/21. 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 9/1711:30 amICN - ONT
1 stop16h 43mUnited Airlines
Wed 9/246:00 amONT - ICN
1 stop17h 00mUnited Airlines
Deal found 5/21$595
This Kissandfly.com deal was found by Cheapflights users on 5/20. 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 6/94:50 pmICN - ONT
1 stop16h 49mLufthansa
Wed 6/256:00 amONT - ICN
1 stop17h 00mLufthansa
Deal found 5/20$710
This Hanatour deal was found by Cheapflights users on 5/21. 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.
Fri 9/58:35 pmICN - ONT
1 stop38h 05mChina Airlines
Mon 9/1512:10 amONT - ICN
1 stop27h 25mChina Airlines
Deal found 5/21$836
This Hawaiian Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 5/239:25 pmICN - ONT
1 stop16h 30mHawaiian Airlines
Sat 5/319:50 amONT - ICN
1 stop17h 10mHawaiian Airlines
Deal found 5/20$909
This Alaska Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 5/239:25 pmICN - ONT
1 stop16h 30mAlaska Airlines
Tue 5/279:50 amONT - ICN
1 stop17h 10mAlaska Airlines
Deal found 5/20$930
This Mytrip deal was found by Cheapflights users on 5/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/231:15 amICN - ONT
2 stops32h 45mMultiple Airlines
Sun 6/2912:10 amONT - ICN
2 stops31h 35mMultiple Airlines
Deal found 5/21$941
This American Airlines deal was found by Cheapflights users on 5/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/175:25 pmICN - ONT
1 stop34h 34mAmerican Airlines
Thu 6/196:23 amONT - ICN
2 stops41h 07mAmerican Airlines
Deal found 5/20$986

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 May 21, 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

Wed 9/17

11:30 am-12:13 pm

1 stop16h 43m

Ontario

Wed 9/24

6:00 am-3:00 pm

1 stop17h 00m

$595

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 6/9

4:50 pm-5:39 pm

1 stop16h 49m

Ontario

Wed 6/25

6:00 am-3:00 pm

1 stop17h 00m

$710

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Fri 9/5

8:35 pm-6:40 pm

1 stop38h 05m

Ontario

Mon 9/15

12:10 am-7:35 pm

1 stop27h 25m

$836

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 6/23

1:15 am-6:00 pm

2 stops32h 45m

Ontario

Sun 6/29

12:10 am-11:45 pm

2 stops31h 35m

$941

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 6/17

5:25 pm-11:59 am

1 stop34h 34m

Ontario

Thu 6/19

6:23 am-3:30 pm

2 stops41h 07m

$986

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 6/16

9:25 pm-12:13 am

2 stops42h 48m

Ontario

Fri 6/20

9:00 am-7:00 pm

1 stop18h 00m

$999

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 11/17

4:10 pm-4:14 pm

2 stops17h 04m

Ontario

Sun 11/30

5:05 pm-3:55 pm

2 stops29h 50m

$1,138

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 7/14

10:00 pm-5:40 pm

2 stops59h 40m

$443

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 8/26

8:35 pm-6:40 pm

1 stop38h 05m

$529

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Wed 5/28

9:25 pm-9:55 pm

1 stop16h 30m

$578

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/21

Showing 1-10 of 17 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 May.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*2 stars
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 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 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, 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 May 21, 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 May 21, 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
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.
EVA Air
8.4
Very good
1,195 reviews
EVA Air
8.4
Very good
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.
Korean Air
8.4
Very good
1,076 reviews
EVA Air
8.4
Very good
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.
China Airlines
8.3
Very good
733 reviews
EVA Air
8.4
Very good
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.
Alaska Airlines
8.0
Very good
10,000 reviews
EVA Air
8.4
Very good
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.
Delta
8.0
Very good
7,951 reviews
EVA Air
8.4
Very good
1,195 reviews

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

TPE - SEA

The flight and crew were exceptional as always when I fly with EVA.

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 $595, was found to be the cheapest airline from Incheon Intl Airport to Ontario.Alternate airlines to your destination round-trip include Lufthansa and China Airlines. United Airlines is 24% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $529. Hawaiian Airlines flights start at $578 while deals on EVA Air start at $665 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 May 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$755FlexibilityNo cancel feeOn-time69%

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