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Southeast Asia

$360+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Aug 7 — Aug 141
Thu 8/7
Thu 8/14
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 August 2, 2025.

Round-trip from

$704
(IEagle)

One-way from

$360
(SmartFares)

Popular in

December

Cheapest in

September

Average price

$843
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 ($125 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 2, 2025.

This IEagle deal was found by Cheapflights users on 7/31. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1312:45 amONT - MNL
1 stop24h 05mChina Airlines
Sat 10/114:50 pmMNL - ONT
1 stop16h 10mChina Airlines
Deal found 7/31$706
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Tue 9/306:00 amONT - SIN
2 stops26h 40mKorean Air
Tue 10/77:30 amSIN - ONT
2 stops30h 19mKorean Air
Deal found 7/30$706
This IEagle deal was found by Cheapflights users on 8/1. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1112:45 amONT - CEB
1 stop19h 20mChina Airlines
Thu 11/1312:10 pmCEB - ONT
1 stop20h 40mChina Airlines
Deal found 8/1$706
This Korean Air deal was found by Cheapflights users on 8/1. 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.
Mon 9/16:00 amONT - MNL
2 stops25h 05mKorean Air
Sun 9/73:05 amMNL - ONT
2 stops29h 06mKorean Air
Deal found 8/1$712
This lol.travel deal was found by Cheapflights users on 8/1. 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.
Thu 9/186:00 amONT - BKK
2 stops25h 45mKorean Air
Fri 10/39:40 pmBKK - ONT
2 stops33h 20mKorean Air
Deal found 8/1$720
This Delta deal was found by Cheapflights users on 7/31. 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.
Sun 9/141:15 pmONT - HAN
2 stops42h 20mDelta
Sun 9/2111:10 pmHAN - ONT
2 stops37h 30mDelta
Deal found 7/31$722
This lol.travel deal was found by Cheapflights users on 8/1. 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.
Sun 8/176:39 pmONT - SIN
1 stop20h 36mUnited Airlines
Thu 8/218:45 amSIN - ONT
1 stop23h 52mUnited Airlines
Deal found 8/1$725
This Delta deal was found by Cheapflights users on 7/30. 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.
Mon 9/86:00 amONT - SIN
2 stops26h 40mDelta
Sun 9/2110:30 pmSIN - ONT
2 stops39h 10mDelta
Deal found 7/30$734
This Korean Air deal was found by Cheapflights users on 7/31. 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.
Thu 8/216:00 amONT - CRK
2 stops27h 25mKorean Air
Tue 9/231:40 amCRK - ONT
2 stops30h 20mKorean Air
Deal found 7/31$747
This American Airlines deal was found by Cheapflights users on 8/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1411:59 pmONT - BKK
2 stops33h 01mAmerican Airlines
Sun 9/218:05 amBKK - ONT
2 stops28h 11mAmerican Airlines
Deal found 8/1$750
This oojo deal was found by Cheapflights users on 7/31. 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.
Fri 11/149:45 pmONT - CRK
1 stop29h 30mSTARLUX Airlines
Sun 11/308:15 pmCRK - ONT
1 stop35h 35mSTARLUX Airlines
Deal found 7/31$751
This American Airlines deal was found by Cheapflights users on 8/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1211:59 pmONT - SGN
2 stops31h 46mAmerican Airlines
Thu 9/48:00 amSGN - ONT
2 stops24h 54mAmerican Airlines
Deal found 8/2$769

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 August 2, 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

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

Sat 1/3

10:50 pm-11:10 am

1 stop20h 20m

Cebu City Mactan Intl

Sun 2/1

12:10 pm-4:50 pm

1 stop20h 40m

$704

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

Tue 9/30

6:00 am-11:40 pm

2 stops26h 40m

Singapore Changi

Tue 10/7

7:30 am-10:49 pm

2 stops30h 19m

$706

OntarioManila

ONT - MNL

ONTMNL

Ontario

Sat 9/13

12:45 am-3:50 pm

1 stop24h 05m

Manila Ninoy Aquino Intl

Sat 10/11

4:50 pm-6:00 pm

1 stop16h 10m

$706

OntarioManila

ONT - MNL

ONTMNL

Ontario

Mon 9/1

6:00 am-11:59 pm

2 stops26h 59m

Manila Ninoy Aquino Intl

Mon 9/8

12:20 pm-5:11 pm

2 stops43h 51m

$712

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 9/18

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Fri 10/3

9:40 pm-5:00 pm

2 stops33h 20m

$720

OntarioHanoi

ONT - HAN

ONTHAN

Ontario

Sun 9/14

1:15 pm-9:35 pm

2 stops42h 20m

Hanoi Noibai

Sun 9/21

11:10 pm-10:40 pm

2 stops37h 30m

$722

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

Sun 8/17

6:39 pm-6:15 am

1 stop20h 36m

Singapore Changi

Thu 8/21

8:45 am-5:37 pm

1 stop23h 52m

$725

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

Mon 9/8

6:00 am-11:40 pm

2 stops26h 40m

Singapore Changi

Sun 9/21

10:30 pm-10:40 pm

2 stops39h 10m

$734

OntarioAngeles City

ONT - CRK

ONTCRK

Ontario

Thu 8/21

6:00 am-12:25 am

2 stops27h 25m

Angeles City Clark Intl

Tue 9/23

1:40 am-5:00 pm

2 stops30h 20m

$747

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 9/14

11:59 pm-11:00 pm

2 stops33h 01m

Bangkok Suvarnabhumi

Sun 9/21

8:05 am-10:16 pm

2 stops28h 11m

$750

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

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 $946). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,563). 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 August 2, 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 August 2, 2025.
Read reviews from past customers who have flown STARLUX Airlines, EVA Air, and Korean Air 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
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
STARLUX Airlines
9.0
Wonderful
199 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
EVA Air
8.4
Very good
1,220 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Korean Air
8.4
Very good
1,122 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Japan Airlines
8.3
Very good
1,541 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
China Airlines
8.3
Very good
755 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Crew

9.3

Food

8.8

Boarding

9.0

Overall

9.0

Comfort

8.9

Entertainment

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.

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.

  • 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 $360. Delta flights start at $371 while deals on China Airlines start at $397 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 - Manila Ninoy Aquino Intl, Ontario - Bangkok Suvarnabhumi 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 $946). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,563). 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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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 August 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$539Average$1,042FlexibilityNo cancel feeOn-time69%
Asiana AirlinesCheapest$640Average$760FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$698Average$868FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$727Average$936FlexibilityNo cancel feeOn-time70%
EVA AirCheapest$732Average$821FlexibilityNo cancel feeOn-time74%
STARLUX AirlinesCheapest$753Average$997FlexibilityNo cancel feeOn-timeN/A
Philippine AirlinesCheapest$767Average$977FlexibilityNo cancel feeOn-time60%

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