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Southeast Asia

$345+ Cheap flights from Ontario (ONT) to Southeast Asia

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
1 adult, Economy
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Cheap flight deals from Ontario to Southeast Asia

Keep the following information in mind while searching for Ontario to Southeast Asia flight deals. Data was last updated septiembre 16, 2025.

Round-trip from

$657
(lol.travel)

One-way from

$345
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$755
From Ontario to Southeast Asia
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One-way flight from Ontario to Southeast Asia
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Highest demand for flights based on searches. 11% potential increase in price ($121 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($50 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 Ontario to Southeast Asia

Cheapest flights from Ontario to Southeast Asia
Explore the most affordable flight options available from Ontario to Southeast Asia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

This lol.travel deal was found by Cheapflights users on 9/16. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/96:45 amONT - SIN
2 stops25h 25mKorean Air
lun. 11/241:35 amSIN - ONT
2 stops31h 34mKorean Air
Deal found 9/16$682
This CrystalTravel deal was found by Cheapflights users on 9/14. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/1612:10 amONT - MNL
1 stop24h 40mChina Airlines
sáb. 11/810:55 amMNL - ONT
1 stop21h 55mChina Airlines
Deal found 9/14$690
This Korean Air deal was found by Cheapflights users on 9/16. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/206:45 amONT - MNL
2 stops36h 15mKorean Air
lun. 1/2611:40 pmMNL - ONT
2 stops38h 58mKorean Air
Deal found 9/16$699
This SmartFares deal was found by Cheapflights users on 9/13. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:45 amONT - BKK
2 stops23h 45mKorean Air
mar. 11/2511:15 pmBKK - ONT
2 stops32h 54mKorean Air
Deal found 9/13$701
This Korean Air deal was found by Cheapflights users on 9/16. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/267:35 amONT - MNL
2 stops24h 55mKorean Air
sáb. 11/2212:55 amMNL - ONT
2 stops38h 00mKorean Air
Deal found 9/16$705
This Korean Air deal was found by Cheapflights users on 9/15. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/217:35 amONT - CGK
2 stops46h 35mKorean Air
dom. 10/269:50 pmCGK - ONT
2 stops38h 51mKorean Air
Deal found 9/15$705
This Delta deal was found by Cheapflights users on 9/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/166:00 amONT - KUL
2 stops48h 10mDelta
mié. 10/111:15 pmKUL - ONT
2 stops39h 27mDelta
Deal found 9/14$706
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/297:35 amONT - CEB
2 stops23h 45mKorean Air
mar. 11/412:15 amCEB - ONT
2 stops32h 55mKorean Air
Deal found 9/13$707
This FlightHub deal was found by Cheapflights users on 9/15. 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.
dom. 10/1912:10 amONT - MNL
1 stop18h 25mChina Airlines
lun. 11/34:55 pmMNL - ONT
1 stop15h 55mChina Airlines
Deal found 9/15$708
This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/26:40 amONT - BKK
2 stops23h 50mKorean Air
mar. 12/99:30 pmBKK - ONT
2 stops34h 37mKorean Air
Deal found 9/14$708
This CrystalTravel deal was found by Cheapflights users on 9/13. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1910:50 pmONT - MNL
1 stop19h 05mChina Airlines
mié. 12/310:55 amMNL - ONT
1 stop21h 55mChina Airlines
Deal found 9/13$709
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/216:00 amONT - HAN
2 stops25h 35mDelta
mié. 10/111:10 pmHAN - ONT
2 stops38h 32mDelta
Deal found 9/15$710

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Southeast Asia 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 septiembre 16, 2025.
Use the filters below to find and compare flights from Ontario to Southeast Asia that are best for you.

Fly from

Ontario

Fly to

Southeast Asia

Route

Depart

Return

Price

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 2/10

6:45 am-8:20 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

mié. 2/25

9:50 pm-10:38 pm

2 stops39h 48m

$700

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

lun. 2/9

6:45 am-8:20 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

mié. 2/25

9:50 pm-10:38 pm

2 stops39h 48m

$700

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 2/10

6:45 am-8:20 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

lun. 2/23

9:50 pm-11:52 pm

2 stops41h 02m

$700

OntarioManila

ONT - MNL

ONTMNL

Ontario

dom. 3/8

6:45 am-10:25 pm

2 stops24h 40m

Manila Ninoy Aquino Intl

mar. 4/7

12:20 pm-5:15 pm

2 stops43h 55m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 10/21

7:35 am-8:10 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

lun. 10/27

9:50 pm-5:10 pm

2 stops33h 20m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

lun. 10/6

7:35 am-8:10 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

jue. 10/16

9:50 pm-5:10 pm

2 stops33h 20m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 10/21

7:35 am-8:10 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

mar. 10/28

9:50 pm-5:10 pm

2 stops33h 20m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 1/6

6:45 am-8:20 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

dom. 1/18

9:50 pm-3:20 pm

2 stops32h 30m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 10/21

7:35 am-8:10 pm

2 stops46h 35m

Jakarta Soekarno-Hatta Intl

dom. 10/26

9:50 pm-10:41 pm

2 stops38h 51m

$705

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

lun. 1/5

4:00 pm-8:20 pm

2 stops61h 20m

Jakarta Soekarno-Hatta Intl

lun. 1/19

9:50 pm-10:38 pm

2 stops39h 48m

$706

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Southeast Asia

Have a flexible travel schedule? Discover the best time to fly to Southeast Asia 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 Southeast Asia

What is the cheapest month to book a flight from Ontario to Southeast Asia?

Currently, September is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $900). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,507). 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 YJX?

Find hourly flight availability from Ontario to Southeast Asia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Southeast Asia as you normally would.

Reviews of airlines servicing Southeast Asia

Get insights into the airlines that provide service to Southeast Asia. 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 Southeast Asia. Reviews last updated septiembre 16, 2025.
Read reviews from past customers who have flown STARLUX Airlines, Korean Air, and China Airlines from Ontario to Southeast Asia. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
STARLUX Airlines
9.0
Wonderful
214 reviews
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
Korean Air
8.4
Very good
1,140 reviews
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
China Airlines
8.3
Very good
767 reviews
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
Asiana Airlines
8.2
Very good
480 reviews
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
United Airlines
7.4
Good
8,924 reviews
STARLUX Airlines
9.0
Wonderful
214 reviews

Entertainment

8.9

Boarding

9.0

Comfort

8.9

Crew

9.2

Overall

9.0

Food

8.8

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!

Related info for your journey

Find useful and relevant information for your journey from Ontario to Southeast Asia. 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 Southeast Asia?

    For a flight from Ontario to Southeast Asia, you will be flying from Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

  • How long is the flight from Ontario to Southeast Asia?

    There are many flights that can get you from Ontario to Southeast Asia in 24h 40m. Fly via Delta, Korean Air, or United Airlines to get the fastest option. The distance from Ontario to Southeast Asia is about 7327 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Ontario to Southeast Asia one-way?

    To fly one-way, consider booking your trip with Korean Air, which is currently one of the cheapest options available, starting at $361. Delta flights start at $368 while deals on United Airlines start at $391 one-way.

  • What are the most popular routes from Ontario to Southeast Asia?

    When deciding which route to take from Ontario to Southeast Asia consider Ontario - Bangkok Suvarnabhumi, Ontario - Manila Ninoy Aquino Intl or Ontario - Ho Chi Minh City as they are the most popular.

  • Can I find deals for flights from Ontario to Southeast Asia that include hotel bookings?

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

  • How can I find direct flights from Ontario to Southeast Asia?

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

  • Can I find deals for business class flights from Ontario to Southeast Asia?

    Yes. Cheapflights offers flight deals from Ontario to Southeast Asia 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 Southeast Asia?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $900). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,507). 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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Alternative routes for Ontario to Southeast Asia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Ontario to Southeast Asia

Discover the top 7 airlines that operate flights from Ontario to Southeast Asia. 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 septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$620Average$1,065FlexibilityNo cancel feeOn-time69%
Asiana AirlinesCheapest$640Average$760FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$698Average$915FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$706Average$957FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$753Average$1,069FlexibilityNo cancel feeOn-timeN/A
Philippine AirlinesCheapest$767Average$964FlexibilityNo cancel feeOn-time60%
EVA AirCheapest$780Average$821FlexibilityNo cancel feeOn-time74%

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