HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Vietnam

$351+ Cheap flights from Ontario (ONT) to Vietnam

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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SGN
Dec 4 — Dec 111
Thu 12/4
Thu 12/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Vietnam with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Vietnam

Keep the following information in mind while searching for Ontario to Vietnam flight deals. Data was last updated November 4, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$698
(oojo)

One-way from

$351
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$753
Provider with most accurate pricing for Los Angeles-Ho Chi Minh City flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Ho Chi Minh City flights.
Search Deals
From Ontario to Vietnam
Search Deals
One-way flight from Ontario to Vietnam
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($249 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Ontario to Vietnam

Cheapest flights from Ontario to Vietnam
Explore the most affordable flight options available from Ontario to Vietnam. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2025.

This oojo deal was found by Cheapflights users on 11/3. 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 11/1710:50 pmONT - SGN
1 stop20h 10mChina Airlines
Wed 12/1711:00 amSGN - ONT
1 stop20h 50mChina Airlines
Deal found 11/3$715
This oojo deal was found by Cheapflights users on 11/3. 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 11/2910:50 pmONT - SGN
1 stop27h 00mChina Airlines
Fri 3/2011:00 amSGN - ONT
1 stop20h 50mChina Airlines
Deal found 11/3$716
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/191:20 pmONT - HAN
2 stops41h 25mDelta
Wed 11/2611:05 pmHAN - ONT
2 stops34h 13mDelta
Deal found 11/2$716
This Gotogate deal was found by Cheapflights users on 11/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2410:50 pmONT - SGN
1 stop20h 10mChina Airlines
Wed 12/105:50 pmSGN - ONT
1 stop38h 00mChina Airlines
Deal found 11/2$717
This oojo deal was found by Cheapflights users on 11/4. 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 11/2410:50 pmONT - SGN
1 stop20h 10mChina Airlines
Tue 12/165:50 pmSGN - ONT
1 stop38h 00mChina Airlines
Deal found 11/4$718
This oojo deal was found by Cheapflights users on 11/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:50 pmONT - SGN
1 stop20h 10mChina Airlines
Tue 12/911:00 amSGN - ONT
1 stop20h 50mChina Airlines
Deal found 11/2$719
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 11/276:00 amONT - SGN
2 stops24h 50mUnited Airlines
Tue 12/1611:05 pmSGN - ONT
2 stops28h 12mUnited Airlines
Deal found 11/3$720
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/256:00 amONT - SGN
2 stops27h 15mUnited Airlines
Thu 12/1111:05 pmSGN - ONT
2 stops28h 13mUnited Airlines
Deal found 11/2$723
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/256:00 amONT - SGN
2 stops27h 15mUnited Airlines
Fri 12/127:30 amSGN - ONT
2 stops19h 48mUnited Airlines
Deal found 11/2$726
This oojo deal was found by Cheapflights users on 11/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:50 pmONT - HAN
1 stop26h 40mChina Airlines
Mon 12/811:35 amHAN - ONT
1 stop20h 15mChina Airlines
Deal found 11/2$726
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/246:00 amONT - SGN
2 stops25h 55mUnited Airlines
Thu 12/1111:05 pmSGN - ONT
2 stops28h 13mUnited Airlines
Deal found 11/2$728
This oojo deal was found by Cheapflights users on 11/3. 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.
Tue 11/410:50 pmONT - HAN
1 stop26h 40mChina Airlines
Tue 11/1811:35 amHAN - ONT
1 stop20h 15mChina Airlines
Deal found 11/3$729

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Vietnam 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 November 4, 2025.
Use the filters below to find and compare flights from Ontario to Vietnam that are best for you.

Fly from

Ontario

Fly to

Vietnam

Route

Depart

Return

Price

OntarioDa Nang

ONT - DAD

ONTDAD

Ontario

Sun 1/18

10:50 pm-4:25 pm

1 stop26h 35m

Da Nang

Tue 6/23

5:35 pm-6:00 pm

1 stop38h 25m

$698

OntarioHanoi

ONT - HAN

ONTHAN

Ontario

Sun 3/29

12:10 am-10:35 am

1 stop20h 25m

Hanoi Noibai

Sat 4/4

11:35 am-6:00 pm

1 stop20h 25m

$703

OntarioHanoi

ONT - HAN

ONTHAN

Ontario

Wed 11/19

1:20 pm-9:45 pm

2 stops41h 25m

Hanoi Noibai

Wed 11/26

11:05 pm-6:18 pm

2 stops34h 13m

$716

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Sun 1/11

6:00 am-9:50 pm

2 stops24h 50m

Ho Chi Minh City

Sun 1/25

11:05 pm-5:43 pm

2 stops33h 38m

$720

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Mon 11/17

6:00 am-9:50 pm

2 stops24h 50m

Ho Chi Minh City

Fri 12/5

6:00 am-12:18 pm

2 stops21h 18m

$740

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Sat 11/29

5:05 am-12:15 am

2 stops28h 10m

Ho Chi Minh City

Sat 12/13

6:00 am-12:18 pm

2 stops21h 18m

$743

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Fri 1/23

6:00 am-12:15 am

2 stops27h 15m

Ho Chi Minh City

Fri 2/6

6:00 am-12:17 pm

2 stops21h 17m

$743

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Mon 11/17

6:00 am-12:15 am

2 stops27h 15m

Ho Chi Minh City

Wed 12/17

6:00 am-12:17 pm

2 stops21h 17m

$743

OntarioDa Nang

ONT - DAD

ONTDAD

Ontario

Wed 2/4

10:50 pm-4:25 pm

1 stop26h 35m

Da Nang

Wed 2/11

10:20 am-4:50 pm

1 stop21h 30m

$744

OntarioHo Chi Minh City

ONT - SGN

ONTSGN

Ontario

Sat 1/17

6:00 am-10:55 pm

2 stops25h 55m

Ho Chi Minh City

Wed 1/21

6:00 am-12:17 pm

2 stops21h 17m

$748

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to Vietnam

Have a flexible travel schedule? Discover the best time to fly to Vietnam 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 Vietnam

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

Currently, April is the cheapest month in which you can book a flight from Ontario to Vietnam (average of $304). Flying from Ontario to Vietnam in July is currently the most expensive (average of $790). 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 VN?

Find hourly flight availability from Ontario to Vietnam. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 4, 2025.

It’s optimal to fly from Ontario to Vietnam at noon. By choosing this option you can save up to 20% on the cost of your flight, compared to a flight in the afternoon.

Reviews of airlines servicing Vietnam

Get insights into the airlines that provide service to Vietnam. 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 Vietnam. Reviews last updated November 4, 2025.
See what other customers who have flown with STARLUX Airlines, Korean Air, and China Airlines from Ontario to Vietnam have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
8.9
Very good
219 reviews

Entertainment

8.8

Crew

9.2

Food

8.7

Boarding

8.9

Overall

8.9

Comfort

8.9

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
STARLUX Airlines
8.9
Very good
219 reviews
STARLUX Airlines
8.9
Very good
219 reviews

Entertainment

8.8

Crew

9.2

Food

8.7

Boarding

8.9

Overall

8.9

Comfort

8.9

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
Korean Air
8.4
Very good
1,160 reviews
STARLUX Airlines
8.9
Very good
219 reviews

Entertainment

8.8

Crew

9.2

Food

8.7

Boarding

8.9

Overall

8.9

Comfort

8.9

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
China Airlines
8.3
Very good
776 reviews
STARLUX Airlines
8.9
Very good
219 reviews

Entertainment

8.8

Crew

9.2

Food

8.7

Boarding

8.9

Overall

8.9

Comfort

8.9

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
Asiana Airlines
8.2
Very good
484 reviews
STARLUX Airlines
8.9
Very good
219 reviews

Entertainment

8.8

Crew

9.2

Food

8.7

Boarding

8.9

Overall

8.9

Comfort

8.9

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!

Related info for your journey

Find useful and relevant information for your journey from Ontario to Vietnam. 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 Vietnam?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Vietnam. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Vietnam?

    For as low as $720, China Airlines can have you in Vietnam from Ontario in 24h 50m. There are 8184 mi between Ontario and Vietnam. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Ontario to Vietnam one-way?

    $368 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Korean Air and United Airlines, with prices starting from $371 and $391, respectively.

  • What are the most popular routes from Ontario to Vietnam?

    The most popular route from Ontario to Vietnam is Ontario - Ho Chi Minh City. You may also consider Ontario - Hanoi Noibai or Ontario - Da Nang.

  • Can I find deals for flights from Ontario to Vietnam that include hotel bookings?

    Yes. In addition to deals on Ontario to Vietnam flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Vietnam?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Vietnam.

  • Can I find deals for business class flights from Ontario to Vietnam?

    Yes. Cheapflights offers flight deals from Ontario to Vietnam 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 Vietnam?

    Currently, April is the cheapest month in which you can book a flight from Ontario to Vietnam (average of $304). Flying from Ontario to Vietnam in July is currently the most expensive (average of $790). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Vietnam

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Haneda flights
Los Angeles to Narita flights
San Francisco to Haneda flights
Los Angeles to Manila flights
San Francisco to Narita flights
Los Angeles to Suvarnabhumi flights
San Francisco to Manila flights
San Francisco to New Delhi flights
Ontario to Narita flights
San Francisco to Taiwan Taoyuan Intl flights
San Francisco to Suvarnabhumi flights
Los Angeles to Ho Chi Minh City flights
Los Angeles to Incheon Intl flights
San Francisco to Hong Kong flights
San Francisco to Mumbai flights
San Diego to Narita flights
San Francisco to Ho Chi Minh City flights
Los Angeles to Taiwan Taoyuan Intl flights
Ontario to Haneda flights
Los Angeles to Hongqiao Intl flights
San Francisco to Incheon Intl flights
Santa Ana to Narita flights
Los Angeles to Hong Kong flights
San Diego to Haneda flights
Los Angeles to Kansai Intl flights
Los Angeles to Pu Dong flights
Santa Ana to Haneda flights
San Jose to New Delhi flights
San Francisco to Hongqiao Intl flights
Ontario to Suvarnabhumi flights
Ontario to Manila flights
Oakland to New Delhi flights
San Francisco to Bangalore flights
San Francisco to Hyderabad flights
San Francisco to Sung Shan flights
Los Angeles to Mumbai flights
San Jose to Haneda flights
Los Angeles to New Delhi flights
Los Angeles to Singapore flights
San Francisco to Pu Dong flights
Santa Ana to Manila flights
San Francisco to Kansai Intl flights
Burbank to Narita flights
Los Angeles to Sung Shan flights
Los Angeles to Don Mueang Intl flights
San Francisco to Chennai flights
Burbank to Manila flights
San Jose to Narita flights
Ontario to Ho Chi Minh City flights
Santa Ana to Suvarnabhumi flights

Top 4 airlines flying from Ontario to Vietnam

Discover the top 4 airlines that operate flights from Ontario to Vietnam. 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 November 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
Asiana AirlinesCheapest$640Average$793FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$714Average$836FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$727Average$906FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$757Average$943FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights