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Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $898

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Reagan-National Airport to Siem Reap departing on 10/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Washington, D.C. Reagan-National Airport to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:30 am - 3:55 pm
DCA
-
SAI
43h 25m
2 stops
Multiple Airlines Logo
10:45 am - 8:00 pm
SAI
-
DCA
44h 15m
2 stops
$1,787Multiple Airlines
Mon, Oct 26 - Fri, Oct 30

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National Airport to Region of 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, momondo users made 832,500 searches. Data last updated June 4, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 10/26

9:30 am-3:55 pm

2 stops43h 25m

Siem Reap–Angkor Intl

Fri 10/30

10:45 am-8:00 pm

2 stops44h 15m

$1,787
Cheapest one-way

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 10/30

5:00 pm-6:05 pm

3 stops38h 05m

$898

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 10/30

9:30 am-3:55 pm

2 stops43h 25m

$921

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 6/29

6:59 pm-9:00 am

3 stops51h 01m

$1,376
Quickest one-way

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 6/29

5:59 pm-9:40 am

2 stops28h 41m

$1,727

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Siem Reap from

How to get the cheapest flight ticket from Washington, D.C. Reagan-National Airport to Region of Siem Reap

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Washington, D.C. Reagan-National to Siem Reap?

United Airlines is the most popular carrier operating from Washington, D.C. Reagan-National to Siem Reap

Cheap Washington, D.C. Reagan-National Airport to Region of Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Reagan-National Airport to Region of Siem Reap

Fastest flight time

43h 25m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Region of Siem Reap takes 43h 25m
There are no direct flights from Washington, D.C. Reagan-National Airport to Region of Siem Reap. There are no popular flight routes from Washington, D.C. Reagan-National Airport to Region of Siem Reap.
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Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Siem Reap

  • When did momondo last update prices for flights from Washington, D.C. Reagan-National Airport to Siem Reap?

    Prices for flights from Washington, D.C. Reagan-National Airport to Siem Reap are refreshed on a daily basis.

  • How old do you have to be to fly from Washington, D.C. Reagan-National Airport to Siem Reap?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Siem Reap.

  • What documentation or ID do you need to fly to Siem Reap?

    The travel and health documents you'll need for your trip to Siem Reap may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Siem Reap. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Siem Reap?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Siem Reap from Washington, D.C..

Can I find flights from Washington, D.C. to Siem Reap with flexible booking policies on momondo?

momondo does allow users to show only those flights to Siem Reap from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Washington, D.C. to Siem Reap?

momondo provides multiple filters to help you find the best flight to Siem Reap from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington, D.C. to Siem Reap right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington, D.C. to Siem Reap now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Siem Reap and let you know when they change.

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