Latest deals
When to book
FAQs
Price Alerts

Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $1,701

This is the cheapest round-trip 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 7/30. 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
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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.
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
10:30 am - 9:59 pm
SAI
-
DCA
46h 29m
2 stops
$1,701Singapore Airlines
Thu, Jul 30 - Thu, Aug 13
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
10:30 am - 9:59 pm
SAI
-
DCA
46h 29m
2 stops
$1,702Singapore Airlines
Thu, Jul 30 - Thu, Aug 13
United Airlines Logo
12:40 pm - 9:40 am
DCA
-
SAI
58h 00m
3 stops
United Airlines Logo
10:30 am - 10:15 pm
SAI
-
DCA
46h 45m
2 stops
$1,747United Airlines
Tue, May 19 - Wed, May 27
United Airlines Logo
12:40 pm - 9:40 am
DCA
-
SAI
58h 00m
3 stops
United Airlines Logo
10:30 am - 4:47 pm
SAI
-
DCA
41h 17m
2 stops
$1,787United Airlines
Tue, May 19 - Fri, May 29
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
10:30 am - 8:06 pm
SAI
-
DCA
44h 36m
2 stops
$1,922Singapore Airlines
Tue, May 19 - Thu, May 28
United Airlines Logo
7:30 am - 9:40 am
DCA
-
SAI
63h 10m
2 stops
United Airlines Logo
10:30 am - 10:15 pm
SAI
-
DCA
46h 45m
2 stops
$1,959United Airlines
Tue, May 19 - Wed, May 27
United Airlines Logo
7:30 am - 9:40 am
DCA
-
SAI
63h 10m
2 stops
United Airlines Logo
10:30 am - 4:47 pm
SAI
-
DCA
41h 17m
2 stops
$1,999United Airlines
Tue, May 19 - Fri, May 29
Multiple Airlines Logo
9:59 am - 3:10 pm
DCA
-
SAI
42h 11m
3 stops
Multiple Airlines Logo
10:30 am - 8:06 pm
SAI
-
DCA
44h 36m
2 stops
$2,115Multiple Airlines
Wed, May 20 - Thu, May 28
United Airlines Logo
12:40 pm - 9:40 am
DCA
-
SAI
34h 00m
3 stops
United Airlines Logo
10:30 am - 10:15 pm
SAI
-
DCA
46h 45m
2 stops
$2,180United Airlines
Wed, May 20 - Wed, May 27
Emirates Logo
2:55 pm - 9:30 pm
DCA
-
SAI
43h 35m
3 stops
Emirates Logo
11:50 pm - 11:45 pm
SAI
-
DCA
34h 55m
3 stops
$2,196Emirates
Thu, Jul 30 - Thu, Aug 13

Emirates flights from Washington, D.C. Reagan-National Airport to Siem Reap

Our best Emirates deals on Washington, D.C. Reagan-National Airport to Siem Reap flight tickets
Emirates
Jul 30
DCA2:55 pmWashington, D.C. Reagan-National
43h 35m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
Aug 13
SAI11:50 pmSiem Reap–Angkor Intl
34h 55m
3 stops
DCA11:45 pmWashington, D.C. Reagan-National
$2,196
Emirates
Jul 30
DCA2:55 pmWashington, D.C. Reagan-National
43h 35m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
Aug 13
SAI11:50 pmSiem Reap–Angkor Intl
33h 36m
3 stops
DCA10:26 pmWashington, D.C. Reagan-National
$2,292
Emirates
May 19
DCA5:00 pmWashington, D.C. Reagan-National
41h 30m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
May 28
SAI11:50 pmSiem Reap–Angkor Intl
33h 59m
3 stops
DCA10:49 pmWashington, D.C. Reagan-National
$2,598

Singapore Airlines flights from Washington, D.C. Reagan-National Airport to Siem Reap

Our best Singapore Airlines deals on Washington, D.C. Reagan-National Airport to Siem Reap flight tickets
Singapore Airlines
Jul 30
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Aug 13
SAI10:30 amSiem Reap–Angkor Intl
46h 29m
2 stops
DCA9:59 pmWashington, D.C. Reagan-National
$1,701
Singapore Airlines
Jul 30
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Aug 13
SAI10:30 amSiem Reap–Angkor Intl
46h 29m
2 stops
DCA9:59 pmWashington, D.C. Reagan-National
$1,702
Singapore Airlines
May 19
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
May 28
SAI10:30 amSiem Reap–Angkor Intl
44h 36m
2 stops
DCA8:06 pmWashington, D.C. Reagan-National
$1,922

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National Airport 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, momondo users made 832,500 searches. Data last updated March 10, 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

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 7/30

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Thu 8/13

10:30 am-9:59 pm

2 stops46h 29m

$1,701

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 7/30

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Thu 8/13

10:30 am-9:59 pm

2 stops46h 29m

$1,702

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

12:40 pm-9:40 am

3 stops58h 00m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-10:15 pm

2 stops46h 45m

$1,747

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

12:40 pm-9:40 am

3 stops58h 00m

Siem Reap–Angkor Intl

Fri 5/29

10:30 am-4:47 pm

2 stops41h 17m

$1,787

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:06 pm

2 stops44h 36m

$1,922

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

7:30 am-9:40 am

2 stops63h 10m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-10:15 pm

2 stops46h 45m

$1,959

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

7:30 am-9:40 am

2 stops63h 10m

Siem Reap–Angkor Intl

Fri 5/29

10:30 am-4:47 pm

2 stops41h 17m

$1,999

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 5/20

9:59 am-3:10 pm

3 stops42h 11m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:06 pm

2 stops44h 36m

$2,115

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 5/20

12:40 pm-9:40 am

3 stops34h 00m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-10:15 pm

2 stops46h 45m

$2,180
Quickest round-trip

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 7/30

2:55 pm-9:30 pm

3 stops43h 35m

Siem Reap–Angkor Intl

Thu 8/13

11:50 pm-11:45 pm

3 stops34h 55m

$2,196

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Washington, D.C. Reagan-National Airport to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Reagan-National Airport to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Reagan-National Airport to Siem Reap (DCA to SAI) flight deals and tips

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

Fastest flight time

30h 16m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Siem Reap takes 30h 16m
There are no direct flights from Washington, D.C. Reagan-National Airport to Siem Reap. There are no popular flight routes from Washington, D.C. Reagan-National Airport to Siem Reap.
Search flight deals

  • How far is Washington, D.C. Reagan-National to Siem Reap–Angkor Intl by plane?

    Washington, D.C. Reagan-National and Siem Reap–Angkor Intl are 8822.8 mi apart from one another. Flights usually cover this in 30h 16m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Washington, D.C. Reagan-National Airport to Siem Reap–Angkor Intl Airport were last updated today.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Siem Reap–Angkor Intl Airport.

  • What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

    The travel and health documents required for your trip to Siem Reap–Angkor Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap–Angkor Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • How do I get Price Alerts for flights from Washington, D.C. Reagan-National Airport to Siem Reap?

    Search flight deals from Washington, D.C. Reagan-National Airport to Siem Reap. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from Washington, D.C. Reagan-National Airport to Siem Reap with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

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

It is quick and easy to find Washington, D.C. to Siem Reap flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Siem Reap that suits you.

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

All flight searches from Washington, D.C. to Siem Reap on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to Siem Reap.

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.

An easier way to manage your Siem Reap trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 4/9
Thu 4/16
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Cambodia

Cabin classes currently available on flights to Siem Reap

List of cabin classes available on flights landing in Siem Reap. Availability may vary depending on flight origin and airline.
First Class to Siem Reap
Business Class to Siem Reap