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Southeast Asia

$378+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$765
(FlightHub)

One-way from

$378
(Justfly.com)

Popular in

December

Cheapest in

March

Average price

$1,092
Provider with most accurate pricing for Los Angeles-Manila Ninoy Aquino Intl flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Manila Ninoy Aquino Intl flights.
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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. 9% potential increase in price ($103 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 May 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 May 1, 2025.

This Korean Air deal was found by Cheapflights users on 4/30. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/137:00 amONT - SIN
2 stops31h 00mKorean Air
Wed 8/207:30 amSIN - ONT
2 stops24h 58mKorean Air
Deal found 4/30$738
This FlightHub deal was found by Cheapflights users on 4/30. 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.
Wed 5/146:00 amONT - MNL
2 stops26h 59mKorean Air
Mon 6/23:05 amMNL - ONT
2 stops30h 15mKorean Air
Deal found 4/30$765
This oojo deal was found by Cheapflights users on 4/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2212:10 amONT - MNL
1 stop18h 25mChina Airlines
Mon 10/64:50 pmMNL - ONT
1 stop16h 10mChina Airlines
Deal found 4/30$769
This United Airlines deal was found by Cheapflights users on 4/29. 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 9/96:00 amONT - HAN
2 stops26h 15mUnited Airlines
Tue 9/3011:35 pmHAN - ONT
2 stops31h 57mUnited Airlines
Deal found 4/29$774
This Delta deal was found by Cheapflights users on 4/29. 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.
Tue 8/266:00 amONT - KUL
2 stops24h 50mDelta
Mon 9/1511:10 pmKUL - ONT
2 stops39h 36mDelta
Deal found 4/29$774
This StudentUniverse deal was found by Cheapflights users on 4/30. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:45 amONT - BKK
2 stops26h 00mKorean Air
Mon 5/199:40 pmBKK - ONT
2 stops34h 40mKorean Air
Deal found 4/30$774
This Ovago deal was found by Cheapflights users on 4/30. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1110:45 pmONT - CEB
1 stop20h 20mChina Airlines
Tue 12/212:05 pmCEB - ONT
1 stop20h 45mChina Airlines
Deal found 4/30$774
This ScholarTrip deal was found by Cheapflights users on 4/30. 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 ScholarTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/47:00 amONT - CEB
2 stops23h 25mKorean Air
Wed 11/1212:10 amCEB - ONT
2 stops29h 08mKorean Air
Deal found 4/30$776
This Delta deal was found by Cheapflights users on 4/30. 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.
Wed 5/76:00 amONT - BKK
2 stops25h 45mDelta
Mon 5/269:50 amBKK - ONT
2 stops22h 30mDelta
Deal found 4/30$777
This Korean Air deal was found by Cheapflights users on 4/30. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/196:00 amONT - KUL
2 stops48h 50mKorean Air
Sun 6/2211:20 pmKUL - ONT
2 stops32h 50mKorean Air
Deal found 4/30$780
This oojo deal was found by Cheapflights users on 4/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2011:10 pmONT - CEB
1 stop19h 40mSTARLUX Airlines
Fri 10/38:05 pmCEB - ONT
1 stop36h 00mSTARLUX Airlines
Deal found 4/30$787
This United Airlines deal was found by Cheapflights users on 4/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/276:00 amONT - MNL
1 stop23h 45mUnited Airlines
Tue 11/119:55 amMNL - ONT
1 stop24h 05mUnited Airlines
Deal found 4/30$798

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 May 1, 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

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

Wed 8/13

7:00 am-5:00 am

2 stops31h 00m

Singapore Changi

Wed 8/20

7:30 am-5:28 pm

2 stops24h 58m

$738

OntarioManila

ONT - MNL

ONTMNL

Ontario

Wed 5/14

6:00 am-11:59 pm

2 stops26h 59m

Manila Ninoy Aquino Intl

Mon 6/2

3:05 am-6:20 pm

2 stops30h 15m

$765

OntarioManila

ONT - MNL

ONTMNL

Ontario

Mon 9/22

12:10 am-9:35 am

1 stop18h 25m

Manila Ninoy Aquino Intl

Mon 10/6

4:50 pm-6:00 pm

1 stop16h 10m

$769

OntarioKuala Lumpur

ONT - KUL

ONTKUL

Ontario

Tue 8/26

6:00 am-9:50 pm

2 stops24h 50m

Kuala Lumpur Intl

Mon 9/15

11:10 pm-11:46 pm

2 stops39h 36m

$774

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/22

7:00 am-1:05 am

2 stops28h 05m

Bangkok Suvarnabhumi

Sun 10/19

2:35 am-11:46 pm

2 stops35h 11m

$777

OntarioKuala Lumpur

ONT - KUL

ONTKUL

Ontario

Mon 5/19

6:00 am-9:50 pm

2 stops48h 50m

Kuala Lumpur Intl

Sun 6/22

11:20 pm-5:10 pm

2 stops32h 50m

$780

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/13

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Tue 5/20

9:40 pm-6:20 pm

2 stops34h 40m

$782

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

Wed 10/1

11:10 pm-7:05 pm

1 stop28h 55m

Cebu City Mactan Intl

Tue 10/14

8:05 pm-5:05 pm

1 stop36h 00m

$787

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

Wed 5/14

6:00 am-11:30 pm

2 stops26h 30m

Cebu City Mactan Intl

Tue 5/27

1:00 am-6:20 pm

2 stops32h 20m

$789

OntarioManila

ONT - MNL

ONTMNL

Ontario

Mon 10/27

10:40 am-8:45 pm

1 stop19h 05m

Manila Ninoy Aquino Intl

Mon 11/10

9:55 am-1:10 pm

1 stop19h 15m

$798

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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, March is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $955). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,574). 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 May 1, 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.

Rainfall in Southeast Asia by month

Plan your trip to Southeast Asia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Southeast Asia ranges from 0.4 - 15.7 inches per month. July is typically the wettest month, when rainfall can reach 15.7 in. February is typically the driest time to visit Southeast Asia when rainfall is around 0.4 in.

Temperature in Southeast Asia by month

Plan your trip to Southeast Asia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Southeast Asia, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

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 May 1, 2025.
Read reviews from past customers who have flown STARLUX Airlines, EVA Air and Korean Air from Ontario to Southeast Asia. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
STARLUX Airlines
9.1
Wonderful
161 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
EVA Air
8.4
Very good
1,186 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Korean Air
8.4
Very good
1,068 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Japan Airlines
8.3
Very good
1,459 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
China Airlines
8.3
Very good
732 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Boarding

9.0

Overall

9.1

Entertainment

9.0

Crew

9.3

Comfort

9.0

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.

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 $378. United Airlines flights start at $394 while deals on Japan Airlines start at $399 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, March is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $955). Flying from Ontario to Southeast Asia in December is currently the most expensive (average of $1,574). 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 9 airlines flying from Ontario to Southeast Asia

Discover the top 9 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$538Average$1,170FlexibilityNo cancel feeOn-time69%
DeltaCheapest$556Average$821FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$657Average$910FlexibilityNo cancel feeOn-time81%
Cathay PacificCheapest$704Average$833FlexibilityNo cancel feeOn-time72%
Asiana AirlinesCheapest$705Average$818FlexibilityNo cancel feeOn-time76%
China AirlinesCheapest$739Average$930FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$741Average$1,111FlexibilityNo cancel feeOn-timeN/A
EVA AirCheapest$780Average$1,271FlexibilityNo cancel feeOn-time74%
Philippine AirlinesCheapest$938Average$1,340FlexibilityNo cancel feeOn-time60%

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