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Southeast Asia

$387+ 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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
febr. 1 — febr. 81
ds. 2/1
ds. 2/8
1 adult, Economy
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Cheap flight deals from Ontario to Southeast Asia

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Southeast Asia (zzYJX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated gener 27, 2025.

Round-trip from

$784
(oojo)

One-way from

$387
(Trip.com)
From Ontario to Southeast Asia
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One-way flight from Ontario to Southeast Asia
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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 gener 27, 2025.

This oojo deal was found by Cheapflights users on 1/27. 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.
dt. 2/2510:45 pmONT - MNL
1 stop25h 10mChina Airlines
dt. 4/810:35 amMNL - ONT
1 stop22h 25mChina Airlines
Deal found 1/27$784
This oojo deal was found by Cheapflights users on 1/27. 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.
dg. 5/412:10 amONT - CEB
1 stop19h 55mChina Airlines
dl. 5/2612:05 pmCEB - ONT
1 stop20h 55mChina Airlines
Deal found 1/27$792
This Delta deal was found by Cheapflights users on 1/26. 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.
dt. 3/115:40 amONT - SIN
2 stops32h 20mDelta
dl. 3/171:30 amSIN - ONT
2 stops35h 52mDelta
Deal found 1/26$801
This United deal was found by Cheapflights users on 1/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dl. 9/296:27 pmONT - SGN
2 stops36h 58mUnited Airlines
dl. 10/2010:45 pmSGN - ONT
2 stops38h 08mUnited Airlines
Deal found 1/26$815
This oojo deal was found by Cheapflights users on 1/27. 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.
dc. 2/1910:45 pmONT - SGN
1 stop27h 05mChina Airlines
dc. 3/1911:00 amSGN - ONT
1 stop20h 50mChina Airlines
Deal found 1/27$841
This Delta deal was found by Cheapflights users on 1/26. 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.
dj. 4/245:40 amONT - SGN
2 stops27h 25mDelta
dj. 5/151:55 pmSGN - ONT
2 stops41h 19mDelta
Deal found 1/26$855
This United Airlines deal was found by Cheapflights users on 1/26. 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.
dt. 2/256:00 amONT - KUL
2 stops26h 15mUnited Airlines
dt. 3/182:15 pmKUL - ONT
2 stops47h 30mUnited Airlines
Deal found 1/26$860
This United deal was found by Cheapflights users on 1/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dc. 4/163:55 pmONT - KUL
2 stops27h 15mMultiple Airlines
dc. 4/236:40 pmKUL - ONT
2 stops31h 25mMultiple Airlines
Deal found 1/26$861
This United Airlines deal was found by Cheapflights users on 1/25. 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.
dc. 10/156:00 amONT - MNL
1 stop32h 55mUnited Airlines
dj. 11/139:55 amMNL - ONT
1 stop16h 04mUnited Airlines
Deal found 1/25$866
This Delta deal was found by Cheapflights users on 1/26. 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.
dl. 2/36:00 amONT - BKK
2 stops24h 30mDelta
dj. 2/2011:15 pmBKK - ONT
2 stops38h 17mDelta
Deal found 1/26$880
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dl. 2/246:00 amONT - BKK
2 stops24h 30mKorean Air
dl. 3/311:15 pmBKK - ONT
2 stops31h 10mKorean Air
Deal found 1/26$881
This oojo deal was found by Cheapflights users on 1/26. 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.
dl. 2/2410:45 pmONT - BKK
1 stop23h 20mChina Airlines
dt. 3/182:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 1/26$884

Find flights from Ontario to Southeast Asia within your budget

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 gener 27, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioManila

ONT - MNL

ONTMNL

Ontario

dt. 4/15

12:10 am-3:50 pm

1 stop24h 40m

Manila Ninoy Aquino Intl

dl. 4/28

4:50 pm-6:00 pm

1 stop16h 10m

$784

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

dg. 5/4

12:10 am-11:05 am

1 stop19h 55m

Cebu City Mactan Intl

dl. 5/26

12:05 pm-6:00 pm

1 stop20h 55m

$792

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

dt. 3/11

5:40 am-5:00 am

2 stops32h 20m

Singapore Changi

dl. 3/17

1:30 am-10:22 pm

2 stops35h 52m

$801

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

dc. 2/19

10:45 pm-4:50 pm

1 stop27h 05m

Ho Chi Minh City

dc. 3/19

11:00 am-5:50 pm

1 stop20h 50m

$841

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

dj. 4/24

5:40 am-11:05 pm

2 stops27h 25m

Ho Chi Minh City

dj. 5/15

1:55 pm-5:14 pm

2 stops41h 19m

$855

OntarioKuala Lumpur

ONT - KUL

ONTKUL

Ontario

dt. 2/25

6:00 am-12:15 am

2 stops26h 15m

Kuala Lumpur Intl

dt. 3/18

2:15 pm-10:45 pm

2 stops47h 30m

$860

OntarioKuala Lumpur

ONT - KUL

ONTKUL

Ontario

dc. 4/16

3:55 pm-10:10 am

2 stops27h 15m

Kuala Lumpur Intl

dc. 4/23

6:40 pm-11:05 am

2 stops31h 25m

$861

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

dc. 4/30

7:05 am-9:25 pm

2 stops24h 20m

Ho Chi Minh City

dj. 5/15

7:00 am-2:25 pm

2 stops21h 25m

$873

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

dt. 2/18

6:00 am-9:30 pm

2 stops24h 30m

Bangkok Suvarnabhumi

dv. 3/7

9:40 am-10:32 pm

2 stops27h 52m

$880

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

dl. 2/24

6:00 am-9:30 pm

2 stops24h 30m

Bangkok Suvarnabhumi

dl. 3/3

11:15 pm-3:25 pm

2 stops31h 10m

$881

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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.

Travel insights for flights from Ontario to Southeast Asia

Get recent, data-driven insights about flights from Ontario to Southeast Asia including ideal travel times, pricing trends, and more.

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

Currently, October is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $996). Flying from Ontario to Southeast Asia in June is currently the most expensive (average of $1,585). 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 gener 27, 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 gener 27, 2025.
Read reviews from past customers who have flown Korean Air, Delta and China Airlines from Ontario to Southeast Asia. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

Korean Air
8.5
Very good
1,036 reviews
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

Japan Airlines
8.3
Very good
1,445 reviews
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

China Airlines
8.2
Very good
729 reviews
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

Delta
8.0
Very good
8,485 reviews
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

Alaska Airlines
8.0
Very good
9,690 reviews
Korean Air
8.5
Very good
1,036 reviews

Crew

8.8

Overall

8.5

Boarding

8.5

Comfort

8.3

Entertainment

8.2

Food

8.1

Reviews

1 / 10

Flight was short, so we did not get food, but that is expected. Only have entertainment a fair rating because no wifi is provided onboard. Good flight overall.

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 United Airlines, which is currently one of the cheapest options available, starting at $426. China Airlines flights start at $457 while deals on Qatar Airways start at $475 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, October is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $996). Flying from Ontario to Southeast Asia in June is currently the most expensive (average of $1,585). 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 10 airlines flying from Ontario to Southeast Asia

Discover the top 10 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 gener 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$538Average$1,197FlexibilityNo cancel feeOn-time69%
DeltaCheapest$589Average$940FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$657Average$923FlexibilityNo cancel feeOn-time81%
Asiana AirlinesCheapest$705Average$990FlexibilityNo cancel feeOn-time76%
Cathay PacificCheapest$710Average$1,094FlexibilityNo cancel feeOn-time72%
China AirlinesCheapest$741Average$1,049FlexibilityNo cancel feeOn-time70%
EVA AirCheapest$780Average$1,139FlexibilityNo cancel feeOn-time74%
Japan AirlinesCheapest$806Average$1,169FlexibilityNo cancel feeOn-time79%
STARLUX AirlinesCheapest$885Average$1,229FlexibilityNo cancel feeOn-timeN/A
Philippine AirlinesCheapest$933Average$1,361FlexibilityNo cancel feeOn-time60%
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