HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Siem Reap

$662+ Cheap flights from Ontario (ONT) to Siem Reap, Cambodia (SAI)

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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAI
Jun 28 — Jul 51
Sun 6/28
Sun 7/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Siem Reap 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 Siem Reap

Cheapest flights from Ontario to Siem Reap
Explore the most affordable flight options available from Ontario to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 29, 2026.

This United Airlines deal was found by Cheapflights users on 5/29. 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.
Wed 9/161:56 pm
ONT
-
SAI
2 stops29h 44m
United Airlines
Wed 9/2310:30 am
SAI
-
ONT
2 stops39h 42m
United Airlines
Deal found 5/29$1,275
This Trip.com deal was found by Cheapflights users on 5/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/612:10 am
ONT
-
SAI
2 stops27h 45m
Multiple Airlines
Sat 10/2410:35 pm
SAI
-
ONT
2 stops33h 15m
Multiple Airlines
Deal found 5/27$1,284
This Trip.com deal was found by Cheapflights users on 5/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:10 am
ONT
-
SAI
2 stops30h 55m
Multiple Airlines
Mon 11/3010:00 am
SAI
-
ONT
2 stops45h 50m
Multiple Airlines
Deal found 5/26$1,311
This Trip.com deal was found by Cheapflights users on 5/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:50 pm
ONT
-
SAI
2 stops23h 25m
Multiple Airlines
Mon 11/3010:00 am
SAI
-
ONT
2 stops45h 50m
Multiple Airlines
Deal found 5/25$1,341
This Mytrip deal was found by Cheapflights users on 5/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/712:45 am
ONT
-
SAI
2 stops31h 10m
Multiple Airlines
Sat 8/1510:35 pm
SAI
-
ONT
2 stops34h 05m
Multiple Airlines
Deal found 5/28$1,415
This FlightHub deal was found by Cheapflights users on 5/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/712:45 am
ONT
-
SAI
2 stops28h 10m
Multiple Airlines
Mon 8/1712:55 pm
SAI
-
ONT
2 stops43h 45m
Multiple Airlines
Deal found 5/26$1,431
This Mytrip deal was found by Cheapflights users on 5/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:45 am
ONT
-
SAI
2 stops27h 35m
Multiple Airlines
Fri 8/149:45 pm
SAI
-
ONT
2 stops34h 55m
Multiple Airlines
Deal found 5/28$1,485
This Trip.com deal was found by Cheapflights users on 5/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/712:45 am
ONT
-
SAI
2 stops27h 05m
Multiple Airlines
Tue 9/297:20 pm
SAI
-
ONT
2 stops36h 40m
Multiple Airlines
Deal found 5/25$1,498
This Justfly.com deal was found by Cheapflights users on 5/28. 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.
Sun 8/212:45 am
ONT
-
SAI
2 stops28h 10m
Multiple Airlines
Mon 8/109:40 am
SAI
-
ONT
2 stops23h 00m
Multiple Airlines
Deal found 5/28$1,521
This Gotogate deal was found by Cheapflights users on 5/28. 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.
Wed 8/512:45 am
ONT
-
SAI
2 stops28h 10m
Multiple Airlines
Thu 8/139:40 am
SAI
-
ONT
2 stops23h 00m
Multiple Airlines
Deal found 5/28$1,545

Find flight deals from Ontario to Siem Reap

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Siem Reap (SAI). 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 May 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,275
(United Airlines)

One-way from

$662
(United Airlines)

Popular in

June

Cheapest in

April

Average price

$1,040
Provider with most accurate pricing for Ontario-Siem Reap–Angkor Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Siem Reap–Angkor Intl flights.
Search Deals
From Ontario to Siem Reap–Angkor Intl
Search Deals
One-way flight from Ontario to Siem Reap–Angkor Intl
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($249 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Siem Reap 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 29, 2026.
Use the filters below to find and compare flights from Ontario to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 9/16

1:56 pm-9:40 am

2 stops29h 44m

Siem Reap–Angkor Intl

Wed 9/30

10:30 am-12:12 pm

2 stops39h 42m

$1,275

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 9/16

1:56 pm-9:40 am

2 stops29h 44m

Siem Reap–Angkor Intl

Wed 9/23

10:30 am-12:12 pm

2 stops39h 42m

$1,275

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Tue 10/6

12:10 am-5:55 pm

2 stops27h 45m

Siem Reap–Angkor Intl

Sat 10/24

10:35 pm-5:50 pm

2 stops33h 15m

$1,284

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 9/30

12:10 am-9:05 pm

2 stops30h 55m

Siem Reap–Angkor Intl

Mon 11/30

10:00 am-4:50 pm

2 stops45h 50m

$1,311

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Thu 11/19

10:50 pm-1:15 pm

2 stops23h 25m

Siem Reap–Angkor Intl

Mon 11/30

10:00 am-4:50 pm

2 stops45h 50m

$1,341

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Mon 9/7

12:45 am-5:50 pm

2 stops27h 05m

Siem Reap–Angkor Intl

Tue 9/29

7:20 pm-6:00 pm

2 stops36h 40m

$1,498

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Tue 8/4

12:45 am-6:55 pm

2 stops28h 10m

Siem Reap–Angkor Intl

Wed 8/12

7:35 pm-6:40 pm

2 stops37h 05m

$1,521

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 8/5

12:45 am-6:55 pm

2 stops28h 10m

Siem Reap–Angkor Intl

Thu 8/13

9:40 am-6:40 pm

2 stops23h 00m

$1,545
Quickest round-trip

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Tue 9/15

12:10 am-6:20 pm

3 stops28h 10m

Siem Reap–Angkor Intl

Wed 9/23

9:40 am-6:00 pm

2 stops22h 20m

$1,781

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Thu 7/30

12:45 am-6:20 pm

2 stops27h 35m

Siem Reap–Angkor Intl

Fri 8/7

9:45 pm-6:40 pm

3 stops34h 55m

$1,838

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/29

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Compare providers for flights from Ontario to Siem Reap

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Siem Reap in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Siem Reap flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Siem Reap flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Siem Reap flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Siem Reap flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap 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.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Siem Reap?

    Airlines like United Airlines fly from Ontario to Siem Reap in about 29h 44m. The time it takes to get you to your destination can typically vary by up to . There are 8155 mi between Ontario and Siem Reap.

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

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

  • How can I find direct flights from Ontario to Siem Reap?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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 Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Siem Reap flights
San Francisco to Siem Reap flights

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.