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Siem Reap

$1,556+ Cheap flights from Reagan-National (DCA) to Siem Reap, Cambodia (SAI)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SAI
Mar 3 — Mar 101
Tue 3/3
Tue 3/10
1 adult, Economy
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Cheap flight deals from Reagan-National to Siem Reap

Cheapest flights from Reagan-National to Siem Reap
Explore the most affordable flight options available from Reagan-National to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 1, 2026.

This oojo deal was found by Cheapflights users on 1/30. 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 12/19:59 am
DCA
-
SAI
2 stops41h 56m
Singapore Airlines
Thu 12/104:45 pm
SAI
-
DCA
2 stops41h 14m
Singapore Airlines
Deal found 1/30$1,556
This Emirates deal was found by Cheapflights users on 1/30. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/13:30 pm
DCA
-
SAI
3 stops41h 40m
Emirates
Thu 12/1011:50 pm
SAI
-
DCA
3 stops32h 53m
Emirates
Deal found 1/30$1,687
This oojo deal was found by Cheapflights users on 1/31. 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.
Fri 6/269:59 am
DCA
-
SAI
2 stops36h 41m
Singapore Airlines
Mon 7/2010:30 am
SAI
-
DCA
2 stops44h 32m
Singapore Airlines
Deal found 1/31$1,780
This United Airlines deal was found by Cheapflights users on 1/30. 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 12/11:00 pm
DCA
-
SAI
3 stops38h 55m
United Airlines
Thu 12/104:45 pm
SAI
-
DCA
2 stops36h 11m
United Airlines
Deal found 1/30$1,799
This United Airlines deal was found by Cheapflights users on 1/31. 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.
Fri 6/267:55 am
DCA
-
SAI
2 stops38h 45m
United Airlines
Mon 7/2010:30 am
SAI
-
DCA
2 stops46h 32m
United Airlines
Deal found 1/31$2,614

Find flight deals from Reagan-National to Siem Reap

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) 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 February 1, 2026.

Most accurate provider

Expedia
1 star

Most trusted provider

Expedia
3 stars

Round-trip from

$1,641
(oojo)
Provider with most accurate pricing for Washington, D.C. (WAS)-Siem Reap–Angkor Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Siem Reap–Angkor Intl flights.
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From Washington, D.C. Reagan-National to Siem Reap–Angkor Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National 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 1, 2026.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Siem Reap that are best for you.

Fly from

Reagan-National

Fly to

Siem Reap

Route

Depart

Return

Price

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 6/26

9:59 am-3:10 pm

3 stops42h 11m

Siem Reap–Angkor Intl

Mon 7/20

10:30 am-8:02 pm

2 stops44h 32m

$1,890

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 6/26

7:55 am-9:40 am

2 stops38h 45m

Siem Reap–Angkor Intl

Mon 7/20

10:30 am-10:02 pm

2 stops46h 32m

$2,614

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

Best time to book a flight from Reagan-National to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Reagan-National 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 Reagan-National 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 into for flights to Siem Reap from Washington, D.C. Reagan-National?

    Located just 24.7 mi from the city center, Siem Reap–Angkor Intl is the airport most travelers will use when flying to Siem Reap from Washington, D.C. Reagan-National. Booking flights from Washington, D.C. Reagan-National to Siem Reap–Angkor Intl (SAI) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Reagan-National from 0 different airlines.

  • How long is the flight from Washington, D.C. Reagan-National Airport to Siem Reap?

    Departing from Washington, D.C. Reagan-National Airport to Siem Reap will take you 38h 45m. The distance from Washington, D.C. Reagan-National Airport to Siem Reap is about 8821 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

  • How can I find direct flights from Reagan-National to Siem Reap?

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

  • Can I find deals for business class flights from Reagan-National to Siem Reap?

    Yes. Cheapflights offers flight deals from Reagan-National 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.

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