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Southeast Asia

$359+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
jun. 21 — jun. 281
sáb. 6/21
sáb. 6/28
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 junio 16, 2025.

Round-trip from

$672
(lol.travel)

One-way from

$365
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$1,288
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. 10% potential increase in price ($120 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($53 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 16, 2025.

This lol.travel deal was found by Cheapflights users on 6/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/76:25 amONT - SIN
2 stops31h 35mKorean Air
mié. 8/207:30 amSIN - ONT
2 stops24h 41mKorean Air
Deal found 6/15$672
This lol.travel deal was found by Cheapflights users on 6/16. 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.
jue. 8/76:39 pmONT - SIN
1 stop20h 36mUnited Airlines
mié. 8/208:45 amSIN - ONT
1 stop18h 28mUnited Airlines
Deal found 6/16$725
This oojo deal was found by Cheapflights users on 6/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/1412:45 amONT - CEB
1 stop19h 20mChina Airlines
lun. 9/2212:05 pmCEB - ONT
1 stop20h 55mChina Airlines
Deal found 6/15$731
This CrystalTravel deal was found by Cheapflights users on 6/15. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/86:00 amONT - DPS
2 stops26h 35mKorean Air
mié. 9/1712:50 amDPS - ONT
2 stops31h 27mKorean Air
Deal found 6/15$747
This FlightHub deal was found by Cheapflights users on 6/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/2211:10 pmONT - CRK
1 stop28h 45mSTARLUX Airlines
mar. 11/258:15 pmCRK - ONT
1 stop35h 35mSTARLUX Airlines
Deal found 6/14$753
This lol.travel deal was found by Cheapflights users on 6/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/76:25 amONT - BKK
2 stops25h 20mKorean Air
mar. 8/192:35 amBKK - ONT
2 stops28h 36mKorean Air
Deal found 6/14$765
This Delta deal was found by Cheapflights users on 6/14. 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. 11/46:45 amONT - CGK
2 stops46h 30mDelta
mié. 11/199:50 pmCGK - ONT
2 stops34h 27mDelta
Deal found 6/14$771
This FlightHub deal was found by Cheapflights users on 6/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:45 amONT - MNL
2 stops26h 14mKorean Air
lun. 11/1711:20 pmMNL - ONT
2 stops33h 57mKorean Air
Deal found 6/16$772
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/281:53 pmONT - MNL
1 stop25h 02mUnited Airlines
mié. 12/39:55 amMNL - ONT
1 stop18h 19mUnited Airlines
Deal found 6/16$778
This FlightHub deal was found by Cheapflights users on 6/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/2011:10 pmONT - CEB
1 stop19h 40mSTARLUX Airlines
vie. 10/38:05 pmCEB - ONT
1 stop36h 00mSTARLUX Airlines
Deal found 6/14$782
This oojo deal was found by Cheapflights users on 6/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/112:10 amONT - MNL
1 stop24h 40mChina Airlines
sáb. 10/1110:35 amMNL - ONT
1 stop22h 25mChina Airlines
Deal found 6/14$783
This Trip.com deal was found by Cheapflights users on 6/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/212:45 amONT - CEB
1 stop19h 20mMultiple Airlines
mié. 10/110:50 amCEB - ONT
1 stop21h 15mMultiple Airlines
Deal found 6/13$787

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 junio 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

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

jue. 8/7

6:25 am-5:00 am

2 stops31h 35m

Singapore Changi

mié. 8/20

7:30 am-5:11 pm

2 stops24h 41m

$672

OntarioSingapore

ONT - SIN

ONTSIN

Ontario

jue. 8/7

6:39 pm-6:15 am

1 stop20h 36m

Singapore Changi

mié. 8/20

8:45 am-12:13 pm

1 stop18h 28m

$725

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

dom. 9/14

12:45 am-11:05 am

1 stop19h 20m

Cebu City Mactan Intl

lun. 9/22

12:05 pm-6:00 pm

1 stop20h 55m

$731

OntarioDenpasar

ONT - DPS

ONTDPS

Ontario

lun. 9/8

6:00 am-11:35 pm

2 stops26h 35m

Denpasar Bali Ngurah Rai

mié. 9/17

12:50 am-5:17 pm

2 stops31h 27m

$747

OntarioAngeles City

ONT - CRK

ONTCRK

Ontario

mié. 10/22

11:10 pm-6:55 pm

1 stop28h 45m

Angeles City Clark Intl

mar. 11/25

8:15 pm-3:50 pm

1 stop35h 35m

$753

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

jue. 8/7

6:25 am-9:45 pm

2 stops25h 20m

Bangkok Suvarnabhumi

mar. 8/19

2:35 am-5:11 pm

2 stops28h 36m

$765

OntarioJakarta

ONT - CGK

ONTCGK

Ontario

mar. 11/4

6:45 am-8:15 pm

2 stops46h 30m

Jakarta Soekarno-Hatta Intl

mié. 11/19

9:50 pm-5:17 pm

2 stops34h 27m

$771

OntarioManila

ONT - MNL

ONTMNL

Ontario

vie. 10/17

6:45 am-11:59 pm

2 stops26h 14m

Manila Ninoy Aquino Intl

lun. 11/17

11:20 pm-5:17 pm

2 stops33h 57m

$772

OntarioManila

ONT - MNL

ONTMNL

Ontario

dom. 9/28

6:36 pm-5:55 am

1 stop20h 19m

Manila Ninoy Aquino Intl

mié. 11/26

9:55 am-12:37 pm

1 stop18h 42m

$778

OntarioCebu City

ONT - CEB

ONTCEB

Ontario

sáb. 9/20

11:10 pm-9:50 am

1 stop19h 40m

Cebu City Mactan Intl

vie. 10/3

8:05 pm-5:05 pm

1 stop36h 00m

$782

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/15

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, March is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $953). 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 junio 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.

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 junio 16, 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
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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
9.1
Wonderful
180 reviews
STARLUX Airlines
9.1
Wonderful
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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
1,204 reviews
STARLUX Airlines
9.1
Wonderful
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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
1,090 reviews
STARLUX Airlines
9.1
Wonderful
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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
1,494 reviews
STARLUX Airlines
9.1
Wonderful
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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
740 reviews
STARLUX Airlines
9.1
Wonderful
180 reviews

Entertainment

9.0

Comfort

9.0

Food

8.9

Overall

9.1

Boarding

9.0

Crew

9.3

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 $365. Delta flights start at $377 while deals on United Airlines start at $410 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, March is the cheapest month in which you can book a flight from Ontario to Southeast Asia (average of $953). 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 8 airlines flying from Ontario to Southeast Asia

Discover the top 8 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 junio 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$538Average$1,068FlexibilityNo cancel feeOn-time69%
Asiana AirlinesCheapest$640Average$760FlexibilityNo cancel feeOn-time76%
Cathay PacificCheapest$704Average$784FlexibilityNo cancel feeOn-time72%
Korean AirCheapest$714Average$890FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$735Average$933FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$745Average$1,065FlexibilityNo cancel feeOn-timeN/A
Philippine AirlinesCheapest$767Average$1,061FlexibilityNo cancel feeOn-time60%
EVA AirCheapest$780Average$903FlexibilityNo cancel feeOn-time74%

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