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Siem Reap

$465+ Cheap flights from Ontario (ONT) to Siem Reap

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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAI
Mar 17 — Mar 241
Tue 3/17
Tue 3/24
1 adult, Economy
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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 February 15, 2026.

This BusinessClass deal was found by Cheapflights users on 2/14. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/111:10 pm
ONT
-
SAI
2 stops29h 35m
Multiple Airlines
Mon 4/277:30 pm
SAI
-
ONT
2 stops59h 35m
Multiple Airlines
Deal found 2/14$972
This Trip.com deal was found by Cheapflights users on 2/12. 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 4/812:10 am
ONT
-
SAI
2 stops42h 35m
Multiple Airlines
Sun 4/197:10 pm
SAI
-
ONT
2 stops36h 50m
Multiple Airlines
Deal found 2/12$985
This BusinessClass deal was found by Cheapflights users on 2/13. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:10 pm
ONT
-
SAI
2 stops29h 35m
Multiple Airlines
Sat 10/107:30 pm
SAI
-
ONT
2 stops59h 35m
Multiple Airlines
Deal found 2/13$1,095
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/36:10 am
ONT
-
SAI
2 stops42h 45m
United Airlines
Sat 3/144:45 pm
SAI
-
ONT
2 stops38h 56m
United Airlines
Deal found 2/11$1,157
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/46:37 pm
ONT
-
SAI
2 stops54h 18m
United Airlines
Sat 3/144:45 pm
SAI
-
ONT
2 stops38h 56m
United Airlines
Deal found 2/11$1,164
This FlightHub deal was found by Cheapflights users on 2/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1810:45 pm
ONT
-
SAI
2 stops47h 55m
Multiple Airlines
Mon 3/307:30 pm
SAI
-
ONT
2 stops59h 35m
Multiple Airlines
Deal found 2/15$1,203
This Trip.com deal was found by Cheapflights users on 2/11. 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 3/410:50 pm
ONT
-
SAI
2 stops27h 40m
Multiple Airlines
Fri 3/139:30 pm
SAI
-
ONT
2 stops34h 20m
Multiple Airlines
Deal found 2/11$1,263
This United Airlines deal was found by Cheapflights users on 2/11. 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 6/111:33 pm
ONT
-
SAI
2 stops54h 07m
United Airlines
Fri 7/310:30 am
SAI
-
ONT
2 stops39h 50m
United Airlines
Deal found 2/11$1,669
This United Airlines deal was found by Cheapflights users on 2/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/141:53 pm
ONT
-
SAI
2 stops59h 02m
United Airlines
Fri 3/610:45 am
SAI
-
ONT
2 stops40h 33m
United Airlines
Deal found 2/14$1,778
This Trip.com deal was found by Cheapflights users on 2/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2010:50 pm
ONT
-
SAI
2 stops27h 50m
Multiple Airlines
Wed 12/239:30 pm
SAI
-
ONT
2 stops34h 20m
Multiple Airlines
Deal found 2/14$1,824

Find flight deals from Ontario to Siem Reap

Keep the following information in mind while searching for Ontario to Siem Reap flight deals. Data was last updated February 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$972
(BusinessClass)

One-way from

$465
(FlightHub)

Popular in

July

Cheapest in

August

Average price

$883
Provider with most accurate pricing for Los Angeles-Siem Reap–Angkor Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Siem Reap–Angkor Intl flights.
Search Deals
From Ontario to Siem Reap
Search Deals
One-way flight from Ontario to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($86 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 15, 2026.
Use the filters below to find and compare flights from Ontario to Siem Reap that are best for you.

Fly from

Ontario

Fly to

Siem Reap

Route

Depart

Return

Price

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 4/1

11:10 pm-6:45 pm

2 stops29h 35m

Siem Reap–Angkor Intl

Mon 4/27

7:30 pm-5:05 pm

2 stops59h 35m

$972

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 4/8

12:10 am-8:45 am

2 stops42h 35m

Siem Reap–Angkor Intl

Sun 4/19

7:10 pm-6:00 pm

2 stops36h 50m

$985

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Thu 3/5

6:15 am-3:55 pm

2 stops42h 40m

Siem Reap–Angkor Intl

Sat 3/14

4:45 pm-5:41 pm

2 stops38h 56m

$1,157

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Tue 3/3

6:10 am-3:55 pm

2 stops42h 45m

Siem Reap–Angkor Intl

Sat 3/14

4:45 pm-5:41 pm

2 stops38h 56m

$1,157

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 3/4

6:37 pm-3:55 pm

2 stops54h 18m

Siem Reap–Angkor Intl

Sat 3/14

4:45 pm-5:41 pm

2 stops38h 56m

$1,164

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 3/18

10:45 pm-12:40 pm

2 stops47h 55m

Siem Reap–Angkor Intl

Mon 3/30

7:30 pm-5:05 pm

2 stops59h 35m

$1,203

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Wed 3/4

10:50 pm-5:30 pm

2 stops27h 40m

Siem Reap–Angkor Intl

Fri 3/13

9:30 pm-5:50 pm

2 stops34h 20m

$1,263

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Thu 6/11

1:33 pm-9:40 am

2 stops54h 07m

Siem Reap–Angkor Intl

Fri 7/3

10:30 am-12:20 pm

2 stops39h 50m

$1,669

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Thu 4/9

1:27 pm-9:40 am

2 stops54h 13m

Siem Reap–Angkor Intl

Sun 4/19

10:30 am-5:47 pm

2 stops45h 17m

$2,339

OntarioSiem Reap

ONT - SAI

ONTSAI

Ontario

Sat 4/25

11:10 pm-6:45 pm

2 stops29h 35m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 12 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Siem Reap
No data available for this route at this time. Please check back soon.

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.

  • What airport do you fly from for flights from Ontario to Siem Reap?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Siem Reap from Ontario.

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

    There are many flights that can get you from Ontario to Region of Siem Reap in 42h 40m. Fly via United Airlines to get the fastest option. There are 8155 mi between Ontario and Region of 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

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