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Southeast Asia

$428+ 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 3/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Mar 15 — Mar 221
Sat 3/15
Sat 3/22
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 March 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$767
(FlightHub)

One-way from

$428
(ScholarTrip)

Popular in

December

Cheapest in

February

Average price

$854
Provider with most accurate pricing for Los Angeles-Manila Ninoy Aquino Intl flight deals.
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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. 8% potential increase in price ($94 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 March 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 March 10, 2025.

This oojo deal was found by Cheapflights users on 3/10. 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.
Sun 4/612:10 amONT - CEB
1 stop19h 55mChina Airlines
Tue 4/2212:05 pmCEB - ONT
1 stop20h 55mChina Airlines
Deal found 3/10$768
This Ovago deal was found by Cheapflights users on 3/9. 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 5/612:10 amONT - MNL
1 stop18h 25mChina Airlines
Wed 5/214:50 pmMNL - ONT
1 stop16h 10mChina Airlines
Deal found 3/9$776
This Delta deal was found by Cheapflights users on 3/10. 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 3/125:40 amONT - BKK
2 stops29h 05mDelta
Wed 3/199:30 pmBKK - ONT
2 stops38h 52mDelta
Deal found 3/10$776
This Korean Air deal was found by Cheapflights users on 3/8. 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 4/235:45 amONT - BKK
2 stops26h 00mMultiple Airlines
Wed 4/309:40 pmBKK - ONT
2 stops33h 04mMultiple Airlines
Deal found 3/8$788
This FlightHub deal was found by Cheapflights users on 3/10. 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.
Mon 3/2411:45 pmONT - SGN
1 stop20h 15mChina Airlines
Mon 4/2110:50 amSGN - ONT
1 stop21h 10mChina Airlines
Deal found 3/10$790
This Travelocity deal was found by Cheapflights users on 3/8. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/305:40 amONT - BKK
2 stops26h 05mKorean Air
Sun 5/119:40 pmBKK - ONT
2 stops34h 39mKorean Air
Deal found 3/8$793
This Delta deal was found by Cheapflights users on 3/8. 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 3/165:40 amONT - SGN
2 stops27h 40mDelta
Tue 4/811:45 pmSGN - ONT
2 stops36h 39mDelta
Deal found 3/8$805
This ScholarTrip deal was found by Cheapflights users on 3/10. 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 4/225:45 amONT - CEB
2 stops26h 45mKorean Air
Mon 5/121:00 amCEB - ONT
2 stops32h 19mKorean Air
Deal found 3/10$810
This United Airlines deal was found by Cheapflights users on 3/10. 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.
Wed 9/36:27 pmONT - SGN
2 stops37h 28mUnited Airlines
Tue 9/3011:15 pmSGN - ONT
2 stops37h 38mUnited Airlines
Deal found 3/10$816
This United deal was found by Cheapflights users on 3/9. 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.
Tue 8/126:43 pmONT - SGN
2 stops37h 12mMultiple Airlines
Tue 9/911:15 pmSGN - ONT
2 stops30h 31mMultiple Airlines
Deal found 3/9$823
This SmartFares deal was found by Cheapflights users on 3/9. 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.
Tue 9/3012:10 amONT - BKK
1 stop26h 10mChina Airlines
Sun 10/125:30 pmBKK - ONT
1 stop38h 30mChina Airlines
Deal found 3/9$828
This ScholarTrip deal was found by Cheapflights users on 3/9. 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 4/15:40 amONT - SGN
2 stops26h 25mKorean Air
Tue 4/297:35 amSGN - ONT
2 stops23h 09mKorean Air
Deal found 3/9$837

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 March 10, 2025.

Fly from

Ontario

Fly to

Southeast Asia

Route

Depart

Return

Price

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

Sun 4/6

12:10 am-11:05 am

1 stop19h 55m

Cebu City Mactan Intl

Tue 4/22

12:05 pm-6:00 pm

1 stop20h 55m

$768

OntarioManila

ONT - MNL

ONTMNL

Ontario

Tue 5/6

12:10 am-9:35 am

1 stop18h 25m

Manila Ninoy Aquino Intl

Wed 5/21

4:50 pm-6:00 pm

1 stop16h 10m

$776

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/30

5:40 am-9:45 pm

2 stops26h 05m

Bangkok Suvarnabhumi

Fri 5/2

11:30 pm-10:57 pm

2 stops37h 27m

$787

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 4/23

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

Wed 4/30

9:40 pm-4:44 pm

2 stops33h 04m

$788

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Mon 3/24

11:45 pm-10:00 am

1 stop20h 15m

Ho Chi Minh City

Mon 4/21

10:50 am-6:00 pm

1 stop21h 10m

$790

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/30

5:40 am-9:45 pm

2 stops26h 05m

Bangkok Suvarnabhumi

Sun 5/11

9:40 pm-6:19 pm

2 stops34h 39m

$793

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

Tue 4/22

5:45 am-11:30 pm

2 stops26h 45m

Cebu City Mactan Intl

Mon 5/12

1:00 am-6:19 pm

2 stops32h 19m

$810

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Sat 4/19

11:45 am-11:15 pm

2 stops45h 30m

Ho Chi Minh City

Sat 5/31

1:55 pm-6:19 pm

2 stops42h 24m

$812

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Wed 9/3

6:27 pm-9:55 pm

2 stops37h 28m

Ho Chi Minh City

Tue 9/30

11:15 pm-10:53 pm

2 stops37h 38m

$816

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Tue 8/12

6:43 pm-9:55 pm

2 stops37h 12m

Ho Chi Minh City

Tue 9/9

11:15 pm-3:46 pm

2 stops30h 31m

$823

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

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, February is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $968). Flying from Ontario to Southeast Asia in June is currently the most expensive (average of $1,577). 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 March 10, 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 March 10, 2025.
Read reviews from past customers who have flown STARLUX Airlines, Korean Air and Japan Airlines 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
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

STARLUX Airlines
9.1
Wonderful
141 reviews
STARLUX Airlines
9.1
Wonderful
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Korean Air
8.4
Very good
1,042 reviews
STARLUX Airlines
9.1
Wonderful
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Japan Airlines
8.3
Very good
1,439 reviews
STARLUX Airlines
9.1
Wonderful
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

China Airlines
8.2
Very good
724 reviews
STARLUX Airlines
9.1
Wonderful
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Delta
8.0
Very good
7,973 reviews
STARLUX Airlines
9.1
Wonderful
141 reviews

Boarding

9.1

Crew

9.3

Entertainment

9.1

Overall

9.1

Food

9.0

Comfort

9.0

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

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 $428. United Airlines flights start at $430 while deals on China Airlines start at $436 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, February is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $968). Flying from Ontario to Southeast Asia in June is currently the most expensive (average of $1,577). 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 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 March 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$538Average$1,173FlexibilityNo cancel feeOn-time69%
DeltaCheapest$589Average$917FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$657Average$932FlexibilityNo cancel feeOn-time81%
Asiana AirlinesCheapest$705Average$983FlexibilityNo cancel feeOn-time76%
Cathay PacificCheapest$710Average$993FlexibilityNo cancel feeOn-time72%
China AirlinesCheapest$742Average$1,049FlexibilityNo cancel feeOn-time70%
Japan AirlinesCheapest$757Average$769FlexibilityNo cancel feeOn-time79%
EVA AirCheapest$780Average$1,271FlexibilityNo cancel feeOn-time74%
STARLUX AirlinesCheapest$885Average$1,187FlexibilityNo cancel feeOn-timeN/A
Philippine AirlinesCheapest$938Average$1,342FlexibilityNo cancel feeOn-time60%
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