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Ontario

$391+ Cheap flights from South Korea 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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ONT
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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Cheap flight deals from South Korea to Ontario

Cheapest flights from South Korea to Ontario
Explore the most affordable flight options available from South Korea to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.

This United Airlines deal was found by Cheapflights users on 2/4. 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.
Tue 3/1711:45 am
ICN
-
ONT
1 stop16h 33m
United Airlines
Sun 4/196:00 am
ONT
-
ICN
1 stop17h 00m
United Airlines
Deal found 2/4$515
This Kissandfly.com deal was found by Cheapflights users on 2/4. 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 2/1612:45 pm
ICN
-
ONT
1 stop16h 53m
Lufthansa
Wed 3/46:37 pm
ONT
-
ICN
1 stop18h 03m
Lufthansa
Deal found 2/4$554
This Hanatour deal was found by Cheapflights users on 2/3. 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.
Sun 2/88:35 pm
ICN
-
ONT
1 stop20h 21m
Hawaiian Airlines
Tue 2/1712:02 pm
ONT
-
ICN
1 stop37h 33m
Hawaiian Airlines
Deal found 2/3$582
This Hanatour deal was found by Cheapflights users on 2/4. 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.
Sat 2/218:35 pm
ICN
-
ONT
1 stop19h 57m
Hawaiian Airlines
Thu 2/266:14 am
ONT
-
ICN
1 stop19h 21m
Hawaiian Airlines
Deal found 2/4$584
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 2/238:35 pm
ICN
-
ONT
1 stop35h 33m
Multiple Airlines
Sat 2/2812:02 pm
ONT
-
ICN
1 stop37h 33m
Multiple Airlines
Deal found 2/3$595
This Alaska Airlines deal was found by Cheapflights users on 2/4. 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 2/58:35 pm
ICN
-
ONT
1 stop20h 21m
Multiple Airlines
Wed 2/186:14 am
ONT
-
ICN
1 stop19h 21m
Multiple Airlines
Deal found 2/4$604
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 2/238:35 pm
ICN
-
ONT
1 stop19h 57m
Multiple Airlines
Fri 2/276:14 am
ONT
-
ICN
1 stop19h 21m
Multiple Airlines
Deal found 2/3$606
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 3/18:35 pm
ICN
-
ONT
1 stop19h 57m
Multiple Airlines
Thu 3/56:14 am
ONT
-
ICN
1 stop19h 21m
Multiple Airlines
Deal found 2/2$613
This Alaska Airlines deal was found by Cheapflights users on 2/4. 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 2/58:35 pm
ICN
-
ONT
1 stop20h 21m
Multiple Airlines
Tue 2/1712:02 pm
ONT
-
ICN
1 stop37h 33m
Multiple Airlines
Deal found 2/4$620
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 2/68:35 pm
ICN
-
ONT
1 stop20h 21m
Multiple Airlines
Wed 2/114:03 pm
ONT
-
ICN
1 stop33h 32m
Multiple Airlines
Deal found 2/3$621
This BusinessClass deal was found by Cheapflights users on 2/4. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/78:35 pm
ICN
-
ONT
1 stop17h 01m
Multiple Airlines
Fri 2/136:14 am
ONT
-
ICN
1 stop19h 21m
Multiple Airlines
Deal found 2/4$622
This China Airlines deal was found by Cheapflights users on 2/3. 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 China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:30 am
PUS
-
ONT
1 stop23h 30m
China Airlines
Wed 4/2212:10 am
ONT
-
PUS
1 stop19h 05m
China Airlines
Deal found 2/3$786

Find flight deals from South Korea to Ontario

Keep the following information in mind while searching for South Korea to Ontario flight deals. Data was last updated February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$508
(KAYAK)

One-way from

$391
(Kiwi.com)

Popular in

October

Cheapest in

November

Average price

$654
Provider with most accurate pricing for Seoul (SEL)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seoul (SEL)-Los Angeles flights.
Search Deals
From South Korea to Ontario
Search Deals
One-way flight from South Korea to Ontario
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($4 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from South Korea 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 February 4, 2026.
Use the filters below to find and compare flights from South Korea to Ontario that are best for you.

Fly from

South Korea

Fly to

Ontario

Route

Depart

Return

Price

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/14

6:00 pm-5:41 pm

1 stop16h 41m

Ontario

Thu 2/19

6:10 am-4:15 pm

1 stop17h 05m

$515

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/21

8:35 pm-11:32 pm

1 stop19h 57m

Ontario

Wed 2/25

6:14 am-6:35 pm

1 stop19h 21m

$606

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sat 2/21

8:35 pm-11:32 pm

1 stop19h 57m

Ontario

Sun 3/1

6:14 am-6:35 pm

1 stop19h 21m

$606

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/19

8:35 pm-11:32 pm

1 stop19h 57m

Ontario

Sun 3/1

6:14 am-6:35 pm

1 stop19h 21m

$606

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Sun 3/8

11:45 am-11:18 am

1 stop16h 33m

Ontario

Sun 4/12

6:00 am-3:00 pm

1 stop17h 00m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 2/19

12:45 pm-8:50 pm

2 stops25h 05m

Ontario

Mon 2/23

9:06 pm-4:15 pm

1 stop26h 09m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 3/10

5:00 pm-5:41 pm

1 stop16h 41m

Ontario

Tue 3/31

6:00 am-3:00 pm

1 stop17h 00m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 3/12

5:00 pm-12:48 pm

2 stops35h 48m

Ontario

Sun 3/15

6:15 am-4:40 am

1 stop30h 25m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Thu 3/5

12:45 pm-12:18 pm

1 stop16h 33m

Ontario

Mon 3/9

6:37 pm-4:40 am

1 stop18h 03m

$650

IncheonOntario

ICN - ONT

ICNONT

Incheon Intl

Tue 2/17

6:00 pm-8:50 pm

2 stops19h 50m

Ontario

Thu 2/26

6:10 am-4:15 pm

1 stop17h 05m

$650

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 47 results
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Best time to book a flight from South Korea to Ontario

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

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

Currently, October is the cheapest month in which you can book a flight from South Korea to Ontario (average of $397). Flying from South Korea to Ontario in August is currently the most expensive (average of $457). 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 KR to ONT?

Find hourly flight availability from South Korea 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 February 4, 2026.

One of the essential ways to save on airfare from South Korea to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 86% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from South Korea to Ontario. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their South Korea to Ontario flight should consider departing on Tuesday afternoons 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.

Related info for your journey

Find useful and relevant information for your journey from South Korea 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 South Korea?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from South Korea. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

    Departing from South Korea to Ontario will take you 16h 41m. Airlines will cover a distance of 6006 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from South Korea to Ontario one-way?

    The cheapest airlines for a one-way flight from South Korea to Ontario are American Airlines ($99), Frontier ($100), and United Airlines ($137).

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

    Most travelers choose Incheon Intl - Ontario, Seoul Gimpo Intl - Ontario or Busan Gimhae - Ontario when deciding on the best route from South Korea to Ontario.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from South Korea to Ontario (average of $397). Flying from South Korea to Ontario in August is currently the most expensive (average of $457). 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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