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Ontario

$338+ Cheap flights from Incheon Intl (ICN) to Ontario (ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$338
(Hawaiian Airlines)

Popular in

January

Cheapest in

May

Average price

$655
From Incheon Intl to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 9/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/118:35 pmICN - ONT
1 stop19h 28mHawaiian Airlines
Sat 11/84:11 pmONT - ICN
1 stop33h 24mHawaiian Airlines
Deal found 9/11$338
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/128:35 pmICN - ONT
1 stop19h 28mAlaska Airlines
Wed 10/296:00 amONT - ICN
1 stop20h 35mAlaska Airlines
Deal found 9/11$347
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:35 pmICN - ONT
1 stop32h 02mAlaska Airlines
Sat 11/111:59 amONT - ICN
1 stop38h 36mAlaska Airlines
Deal found 9/11$359
This Tourvis deal was found by Cheapflights users on 9/11. 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 Tourvis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/148:35 pmICN - ONT
1 stop33h 37mHawaiian Airlines
Thu 9/187:40 pmONT - ICN
1 stop30h 55mHawaiian Airlines
Deal found 9/11$360
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:35 pmICN - ONT
2 stops32h 26mAlaska Airlines
Thu 10/306:00 amONT - ICN
1 stop20h 35mAlaska Airlines
Deal found 9/11$453
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/209:25 pmICN - ONT
2 stops37h 08mAlaska Airlines
Sun 11/25:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 9/11$456
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:35 pmICN - ONT
2 stops19h 16mAlaska Airlines
Wed 10/296:00 amONT - ICN
1 stop20h 35mAlaska Airlines
Deal found 9/11$462
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/199:25 pmICN - ONT
2 stops31h 12mAlaska Airlines
Sun 11/25:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 9/11$465
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/129:25 pmICN - ONT
2 stops31h 12mAlaska Airlines
Sun 11/25:00 amONT - ICN
1 stop19h 35mAlaska Airlines
Deal found 9/11$474
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/229:25 pmICN - ONT
2 stops42h 26mAlaska Airlines
Tue 10/289:45 amONT - ICN
1 stop17h 40mAlaska Airlines
Deal found 9/11$475
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/118:35 pmICN - ONT
2 stops43h 16mAlaska Airlines
Fri 10/171:31 pmONT - ICN
1 stop37h 04mAlaska Airlines
Deal found 9/11$486
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/229:25 pmICN - ONT
2 stops42h 26mAlaska Airlines
Sat 11/14:11 pmONT - ICN
1 stop34h 24mAlaska Airlines
Deal found 9/11$489

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 September 11, 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 10/12

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Sun 11/2

5:00 am-5:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 10/19

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Thu 10/30

6:00 am-6:35 pm

1 stop20h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 10/20

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Wed 10/29

6:00 am-6:35 pm

1 stop20h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 10/12

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Wed 10/29

6:00 am-6:35 pm

1 stop20h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 10/13

8:35 pm-12:03 am

1 stop19h 28m

Ontario

Wed 11/5

6:00 am-6:35 pm

1 stop19h 35m

$347

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 10/20

9:25 pm-12:37 pm

2 stops31h 12m

Ontario

Thu 10/30

9:45 am-7:25 pm

1 stop17h 40m

$456

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 12/14

8:35 pm-8:03 pm

2 stops16h 28m

Ontario

Sun 2/1

6:00 am-6:35 pm

1 stop19h 35m

$462

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 10/19

9:25 pm-12:37 pm

2 stops31h 12m

Ontario

Wed 10/29

6:00 am-6:35 pm

1 stop20h 35m

$465

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 10/19

9:25 pm-12:37 pm

2 stops31h 12m

Ontario

Sun 11/2

5:00 am-5:35 pm

1 stop19h 35m

$465

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Mon 12/22

6:00 pm-12:38 pm

2 stops35h 38m

Ontario

Mon 12/29

6:00 am-4:15 pm

1 stop17h 15m

$519

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 22 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 September 11, 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 September 11, 2025.
See what other customers who have flown with United 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.
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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.

  • How long is the flight from Incheon Intl Airport to Ontario?

    For as low as $347, Alaska Airlines can have you in Ontario from Incheon Intl Airport in 19h 28m. Airlines will cover a distance of 6006 mi.

  • What is the cheapest airline to fly from Incheon Intl Airport to Ontario round-trip?

    United Airlines, at $550, was found to be the cheapest airline from Incheon Intl Airport to Ontario..

  • 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$702FlexibilityNo cancel feeOn-time69%

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