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$509+ Cheap flights from Ontario (ONT) to South Korea

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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ICN
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheap flight deals from Ontario to South Korea

Keep the following information in mind while searching for Ontario to South Korea flight deals. Data was last updated October 28, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$832
(Kiwi.com)

One-way from

$509
(oojo)

Popular in

December

Cheapest in

November

Average price

$990
Provider with most accurate pricing for Los Angeles-Seoul (SEL) flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Seoul (SEL) flights.
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From Ontario to South Korea
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One-way flight from Ontario to South Korea
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Highest demand for flights based on searches. 1% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Ontario to South Korea

Cheapest flights from Ontario to South Korea
Explore the most affordable flight options available from Ontario to South Korea. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:42 pmONT - ICN
1 stop28h 48mMultiple Airlines
Sat 11/229:20 pmICN - ONT
2 stops36h 37mMultiple Airlines
Deal found 10/27$832
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:42 pmONT - ICN
1 stop28h 48mMultiple Airlines
Tue 11/259:20 pmICN - ONT
2 stops58h 06mMultiple Airlines
Deal found 10/27$834
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:42 pmONT - ICN
1 stop28h 48mMultiple Airlines
Sun 11/239:20 pmICN - ONT
2 stops36h 37mMultiple Airlines
Deal found 10/27$840
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:42 pmONT - ICN
2 stops37h 28mMultiple Airlines
Mon 11/246:55 pmICN - ONT
1 stop21h 36mMultiple Airlines
Deal found 10/27$841
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:42 pmONT - ICN
2 stops37h 28mMultiple Airlines
Fri 11/216:55 pmICN - ONT
1 stop21h 36mMultiple Airlines
Deal found 10/27$852
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/410:12 pmONT - ICN
1 stop29h 18mMultiple Airlines
Fri 12/268:35 pmICN - ONT
2 stops20h 37mMultiple Airlines
Deal found 10/26$863
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1410:42 pmONT - ICN
2 stops29h 53mMultiple Airlines
Sun 11/236:55 pmICN - ONT
1 stop21h 36mMultiple Airlines
Deal found 10/27$866
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1410:42 pmONT - ICN
2 stops29h 53mMultiple Airlines
Fri 11/216:55 pmICN - ONT
1 stop21h 36mMultiple Airlines
Deal found 10/27$867
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:37 pmONT - ICN
2 stops37h 53mMultiple Airlines
Fri 11/216:55 pmICN - ONT
1 stop21h 36mMultiple Airlines
Deal found 10/27$869
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/111:50 pmONT - PUS
1 stop19h 00mChina Airlines
Sat 11/810:10 amPUS - ONT
1 stop23h 40mChina Airlines
Deal found 10/28$912
This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/3010:50 pmONT - PUS
1 stop19h 00mChina Airlines
Tue 12/1611:50 amPUS - ONT
1 stop22h 00mChina Airlines
Deal found 10/28$926
This oojo deal was found by Cheapflights users on 10/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/3010:50 pmONT - PUS
1 stop27h 00mChina Airlines
Mon 12/2211:50 amPUS - ONT
1 stop22h 00mChina Airlines
Deal found 10/27$939

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to South Korea 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 October 28, 2025.
Use the filters below to find and compare flights from Ontario to South Korea that are best for you.

Fly from

Ontario

Fly to

South Korea

Route

Depart

Return

Price

OntarioBusan

ONT - PUS

ONTPUS

Ontario

Mon 1/19

10:50 pm-6:50 pm

1 stop27h 00m

Busan Gimhae

Tue 1/27

11:50 am-4:50 pm

1 stop22h 00m

$863

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 4/12

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Fri 4/24

12:35 pm-6:00 pm

1 stop21h 25m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Wed 4/8

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Sat 4/25

12:35 pm-6:00 pm

1 stop21h 25m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 1/11

10:50 pm-11:20 am

1 stop19h 30m

Incheon Intl

Sun 1/25

12:30 pm-4:50 pm

1 stop21h 20m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 4/12

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Mon 4/27

12:35 pm-6:00 pm

1 stop21h 25m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Mon 4/13

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Mon 4/27

12:35 pm-6:00 pm

1 stop21h 25m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Wed 4/8

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Tue 4/28

12:35 pm-6:00 pm

1 stop21h 25m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 1/11

10:50 pm-11:20 am

1 stop19h 30m

Incheon Intl

Fri 1/23

12:30 pm-4:50 pm

1 stop21h 20m

$914

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sat 4/11

12:10 am-11:15 am

1 stop19h 05m

Incheon Intl

Sun 4/26

12:35 pm-6:00 pm

1 stop21h 25m

$926

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Wed 1/28

10:50 pm-11:20 am

1 stop19h 30m

Incheon Intl

Wed 2/4

12:30 pm-4:50 pm

1 stop21h 20m

$926

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 51 results
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Best time to book a flight from Ontario to South Korea

Have a flexible travel schedule? Discover the best time to fly to South Korea from Ontario 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 Ontario to South Korea

What is the cheapest month to book a flight from Ontario to South Korea?

Currently, October is the cheapest month in which you can book a flight from Ontario to South Korea (average of $360). Flying from Ontario to South Korea in June is currently the most expensive (average of $534). 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 ONT to KR?

Find hourly flight availability from Ontario to South Korea. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to South Korea at noon. If you’re flexible enough to do this you can expect to save up to 54% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Ontario to South Korea?

Use this chart to determine the cheapest time to fly round-trip from Ontario to South Korea. Price data was last updated on December 1, 2024.

Travelers seeking maximum savings on their Ontario to South Korea flight should consider departing on Monday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing South Korea

Get insights into the airlines that provide service to South Korea. 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 South Korea. Reviews last updated October 28, 2025.
Read through reviews of airlines operating flights from Ontario to South Korea, such as Korean Air, China Airlines, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,155 reviews

Crew

8.7

Entertainment

8.2

Overall

8.4

Boarding

8.5

Comfort

8.3

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very good
1,155 reviews
Korean Air
8.4
Very good
1,155 reviews

Crew

8.7

Entertainment

8.2

Overall

8.4

Boarding

8.5

Comfort

8.3

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
China Airlines
8.3
Very good
776 reviews
Korean Air
8.4
Very good
1,155 reviews

Crew

8.7

Entertainment

8.2

Overall

8.4

Boarding

8.5

Comfort

8.3

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
United Airlines
7.4
Good
9,001 reviews
Korean Air
8.4
Very good
1,155 reviews

Crew

8.7

Entertainment

8.2

Overall

8.4

Boarding

8.5

Comfort

8.3

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Related info for your journey

Find useful and relevant information for your journey from Ontario to South Korea. 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 from for flights from Ontario to South Korea?

    If you book a flight to South Korea from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Ontario to South Korea?

    China Airlines, Korean Air, and Delta can get you from Ontario to South Korea in just under 20h 15m. Your travel time can differ by up to 6h 45m. There are 6185 mi between Ontario and South Korea. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Ontario to South Korea?

    While some choose either Ontario - Busan Gimhae or Ontario - Seoul Gimpo Intl, Ontario - Incheon Intl is the most popular route from Ontario to South Korea.

  • Can I find deals for flights from Ontario to South Korea that include hotel bookings?

    Yes. In addition to deals on Ontario to South Korea flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to South Korea?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to South Korea.

  • Can I find deals for business class flights from Ontario to South Korea?

    Yes. Cheapflights offers flight deals from Ontario to South Korea 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 Ontario to South Korea?

    Currently, October is the cheapest month in which you can book a flight from Ontario to South Korea (average of $360). Flying from Ontario to South Korea in June is currently the most expensive (average of $534). 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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Top 2 airlines flying from Ontario to South Korea

Discover the top 2 airlines that operate flights from Ontario to South Korea. 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
China AirlinesCheapest$896Average$1,062FlexibilityNo cancel feeOn-time70%
Korean AirCheapest$1,111Average$1,257FlexibilityNo cancel feeOn-time81%

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