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Cheap flights from Ontario to Seoul from $434

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Seoul departing on 8/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Ontario to Seoul (ONT-ICN)

Cheap round-trip flights

Alaska Airlines Logo
8:35 am - 7:00 pmONT-ICN
18h 25m1 stop
Alaska Airlines Logo
9:25 pm - 2:12 pmICN-ONT
32h 47m2 stops
$791Alaska Airlines
Find Deal
Tue, Aug 26 - Wed, Sep 3
Logo
10:13 pm - 8:30 pmONT-ICN
30h 17m1 stop
Logo
6:20 pm - 11:38 pmICN-ONT
21h 18m1 stop
$854
Find Deal
Sun, Sep 21 - Mon, Sep 29
Logo
9:46 pm - 8:30 pmONT-ICN
30h 44m1 stop
Logo
6:20 pm - 11:38 pmICN-ONT
21h 18m1 stop
$855
Find Deal
Thu, Sep 25 - Mon, Sep 29
Logo
6:00 am - 1:35 pmONT-ICN
39h 35m2 stops
Logo
6:20 pm - 11:38 pmICN-ONT
21h 18m1 stop
$862
Find Deal
Sun, Sep 21 - Mon, Sep 29
Logo
10:09 am - 12:35 pmONT-ICN
34h 26m2 stops
Logo
6:20 pm - 11:38 pmICN-ONT
21h 18m1 stop
$864
Find Deal
Tue, Sep 23 - Mon, Sep 29
Logo
6:00 am - 9:10 pmONT-ICN
23h 10m2 stops
Logo
6:20 pm - 11:38 pmICN-ONT
21h 18m1 stop
$875
Find Deal
Wed, Sep 24 - Mon, Sep 29
China Airlines Logo
10:50 pm - 11:20 amONT-ICN
19h 30m1 stop
China Airlines Logo
12:30 pm - 4:50 pmICN-ONT
21h 20m1 stop
$895China Airlines
Find Deal
Mon, Jan 5 - Sun, Jan 18
Hawaiian Airlines Logo
9:45 am - 7:25 pmONT-ICN
17h 40m1 stop
Hawaiian Airlines Logo
8:35 pm - 6:39 pmICN-ONT
15h 04m1 stop
$913Hawaiian Airlines
Find Deal
Thu, Oct 30 - Mon, Nov 24
China Airlines Logo
12:10 am - 7:35 pmONT-ICN
27h 25m1 stop
China Airlines Logo
12:35 pm - 6:00 pmICN-ONT
21h 25m1 stop
$928China Airlines
Find Deal
Fri, Sep 19 - Fri, Sep 26
China Airlines Logo
12:10 am - 7:35 pmONT-ICN
27h 25m1 stop
China Airlines Logo
12:30 pm - 4:50 pmICN-ONT
21h 20m1 stop
$929China Airlines
Find Deal
Mon, Oct 13 - Tue, Nov 18

China Airlines flights from Ontario to Incheon Intl Airport

Our best China Airlines deals on Ontario to Incheon Intl Airport flight tickets
China Airlines
Jan 5
ONT10:50 pmOntario
19h 30m
1 stop
ICN11:20 amIncheon Intl
Jan 18
ICN12:30 pmIncheon Intl
21h 20m
1 stop
ONT4:50 pmOntario
$895
Find similar
China Airlines
Sep 19
ONT12:10 amOntario
27h 25m
1 stop
ICN7:35 pmIncheon Intl
Sep 26
ICN12:35 pmIncheon Intl
21h 25m
1 stop
ONT6:00 pmOntario
$928
Find similar
China Airlines
Oct 13
ONT12:10 amOntario
27h 25m
1 stop
ICN7:35 pmIncheon Intl
Nov 18
ICN12:30 pmIncheon Intl
21h 20m
1 stop
ONT4:50 pmOntario
$929
Find similar

Alaska Airlines flights from Ontario to Incheon Intl Airport

Our best Alaska Airlines deals on Ontario to Incheon Intl Airport flight tickets
Alaska Airlines
Aug 26
ONT8:35 amOntario
18h 25m
1 stop
ICN7:00 pmIncheon Intl
Sep 3
ICN9:25 pmIncheon Intl
32h 47m
2 stops
ONT2:12 pmOntario
$791
Find similar
Alaska Airlines
Aug 28
ONT6:00 amOntario
45h 00m
2 stops
ICN7:00 pmIncheon Intl
Sep 6
ICN9:25 pmIncheon Intl
42h 29m
2 stops
ONT11:54 pmOntario
$966
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Incheon Intl Airport 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, momondo users made 832,500 searches. Data last updated August 17, 2025.
Use the filters below to find and compare flights from Ontario to Incheon Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Tue 8/26

8:35 am-7:00 pm

1 stop18h 25m

Incheon Intl

Wed 9/3

9:25 pm-2:12 pm

2 stops32h 47m

$791

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 9/21

10:13 pm-8:30 pm

1 stop30h 17m

Incheon Intl

Mon 9/29

6:20 pm-11:38 pm

1 stop21h 18m

$854

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Thu 9/25

9:46 pm-8:30 pm

1 stop30h 44m

Incheon Intl

Mon 9/29

6:20 pm-11:38 pm

1 stop21h 18m

$855

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Sun 9/21

6:00 am-1:35 pm

2 stops39h 35m

Incheon Intl

Mon 9/29

6:20 pm-11:38 pm

1 stop21h 18m

$862

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Tue 9/23

10:09 am-12:35 pm

2 stops34h 26m

Incheon Intl

Mon 9/29

6:20 pm-11:38 pm

1 stop21h 18m

$864

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Wed 9/24

6:00 am-9:10 pm

2 stops23h 10m

Incheon Intl

Mon 9/29

6:20 pm-11:38 pm

1 stop21h 18m

$875

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Mon 1/5

10:50 pm-11:20 am

1 stop19h 30m

Incheon Intl

Sun 1/18

12:30 pm-4:50 pm

1 stop21h 20m

$895

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Thu 10/30

9:45 am-7:25 pm

1 stop17h 40m

Incheon Intl

Mon 11/24

8:35 pm-6:39 pm

1 stop15h 04m

$913

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Fri 9/19

12:10 am-7:35 pm

1 stop27h 25m

Incheon Intl

Fri 9/26

12:35 pm-6:00 pm

1 stop21h 25m

$928

OntarioIncheon

ONT - ICN

ONTICN

Ontario

Mon 10/13

12:10 am-7:35 pm

1 stop27h 25m

Incheon Intl

Tue 11/18

12:30 pm-4:50 pm

1 stop21h 20m

$929

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seoul from

How to get the cheapest flight ticket from Ontario to Incheon Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Incheon Intl Airport?

The cheapest day to depart from Ontario to Incheon Intl Airport is on a Monday when prices can be found for as low as $818. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $987. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

What is the cheapest time of day to depart on your flight to Incheon Intl Airport?

In the morning is the cheapest time of day to fly from Ontario to Incheon Intl Airport when you can find flight prices for as low as $834. Flying to Incheon Intl Airport in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $914 on average. Flights to Incheon Intl Airport from Ontario in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on Ontario to Incheon Intl Airport flights?

You could potentially save up to 13% on your flight if you consider stops on a Ontario to Incheon Intl Airport flight.

When to book flights from Ontario to Incheon Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Incheon Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Incheon Intl Airport (ONT to ICN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Incheon Intl Airport

Best Price Found

$434

Fastest flight time

16h 15m

Direct flights

None
The best one-way flight to Incheon Intl Airport from Ontario in the past 72 hours is $434. The best round-trip flight deal from Ontario to Incheon Intl Airport found on momondo in the last 72 hours is $791.
The fastest flight from Ontario to Incheon Intl Airport takes 16h 15m
There are no direct flights from Ontario to Incheon Intl Airport. Popular non-direct route for this connection is Ontario Airport - Incheon Intl Airport.
Search flight deals

  • How far is Ontario to Incheon Intl by plane?

    The distance between Ontario and Incheon Intl is about 6003.0 mi. Flights usually cover this in 17h 12m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ontario Airport to Incheon Intl Airport?

    Prices for flights from Ontario Airport to Incheon Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Incheon Intl Airport?

  • How old do you have to be to fly from Ontario Airport to Incheon Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Incheon Intl Airport.

  • What documentation or ID do you need to fly to Incheon Intl Airport?

    The necessary travel and health documents for your Incheon Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Incheon Intl Airport?

Best airlines flying from Ontario to Incheon Intl Airport

Compare and see reviews for airlines that fly from Ontario to Incheon Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
China AirlinesPriceFrom $961Free CancellationRating
8.3
764 reviews
Search China Airlines flights
Korean AirPriceFrom $1,111Free CancellationRating
8.4
1,131 reviews
Search Korean Air flights

Traveling to a place near Seoul?

Book flights to Seoul if you plan to visit one of these locations
Suwon
Seongnam
Daejeon
Anyang

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Seoul?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seoul from Ontario.

Can I find flights from Ontario to Seoul with flexible booking policies on momondo?

momondo does allow users to show only those flights to Seoul from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Seoul?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Seoul.

I’m not ready to book a flight from Ontario to Seoul right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Seoul flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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