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Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $801

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 1/8. 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

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
9:30 am - 3:55 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
42h 25m2 stops Los Angeles Los Angeles Singapore Changi
Singapore Airlines Logo
10:45 am - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
45h 15m2 stops Singapore Changi Los Angeles Los Angeles
$1,436Singapore Airlines
Sun, Jan 17 - Wed, Jan 27
Multiple Airlines Logo
6:00 am - 9:50 amDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
39h 50m3 stops New York John F Kennedy Intl Frankfurt am Main Singapore Changi
Multiple Airlines Logo
4:45 pm - 10:59 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
42h 14m3 stops Singapore Changi Frankfurt am Main New York John F Kennedy Intl
$1,502Multiple Airlines
Sun, Jan 17 - Wed, Jan 27
Multiple Airlines Logo
6:25 am - 9:50 amDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
39h 25m3 stops New York John F Kennedy Intl Frankfurt am Main Singapore Changi
Multiple Airlines Logo
4:45 pm - 10:48 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
42h 03m3 stops Singapore Changi Frankfurt am Main New York John F Kennedy Intl
$1,613Multiple Airlines
Sat, Nov 7 - Sat, Nov 14
Singapore Airlines Logo
9:30 am - 3:55 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
42h 25m2 stops Los Angeles Los Angeles Singapore Changi
Singapore Airlines Logo
10:45 am - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
45h 15m2 stops Singapore Changi Los Angeles Los Angeles
$1,836Singapore Airlines
Sat, Nov 7 - Sat, Nov 14
Multiple Airlines Logo
6:57 pm - 3:10 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
57h 13m2 stops San Francisco Singapore Changi
Multiple Airlines Logo
10:45 am - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
44h 15m2 stops Singapore Changi Los Angeles Los Angeles
$1,867Multiple Airlines
Tue, Oct 20 - Fri, Oct 30
Multiple Airlines Logo
9:30 am - 3:55 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
42h 25m2 stops Los Angeles Los Angeles Singapore Changi
Multiple Airlines Logo
10:45 am - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
45h 15m2 stops Singapore Changi Los Angeles Los Angeles
$1,896Multiple Airlines
Sat, Nov 7 - Sat, Nov 14
Singapore Airlines Logo
9:30 am - 3:10 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
42h 40m3 stops Los Angeles Los Angeles Tokyo Narita Singapore Changi
Singapore Airlines Logo
10:30 am - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
44h 30m2 stops Singapore Changi Los Angeles Los Angeles
$2,836Singapore Airlines
Mon, Sep 28 - Sun, Oct 4
Singapore Airlines Logo
9:30 am - 3:10 pmDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
42h 40m2 stops Los Angeles Los Angeles Singapore Changi
Singapore Airlines Logo
4:00 pm - 8:00 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
39h 00m2 stops Singapore Changi Los Angeles Los Angeles
$3,032Singapore Airlines
Mon, Sep 28 - Sun, Oct 4
Multiple Airlines Logo
4:00 pm - 8:45 amDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
28h 45m3 stops Montreal Pierre Elliott Trudeau Intl Paris Charles de Gaulle Bangkok Suvarnabhumi
Multiple Airlines Logo
9:50 am - 8:58 amSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
35h 08m3 stops Bangkok Suvarnabhumi Manila Ninoy Aquino Intl Toronto Pearson Intl
$3,350Multiple Airlines
Sat, Dec 26 - Sat, Jan 2
United Airlines Logo
7:00 pm - 9:40 amDCA  Washington, D.C. Reagan-National-SAI Siem Reap–Angkor Intl
27h 40m2 stops San Francisco Singapore Changi
United Airlines Logo
10:30 am - 10:30 pmSAI  Siem Reap–Angkor Intl-DCA Washington, D.C. Reagan-National
47h 00m2 stops Singapore Changi San Francisco
$4,314United Airlines
Sat, Aug 29 - Mon, Sep 7

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

Our best United Airlines deals on Washington, D.C. Reagan-National Airport to Siem Reap flight tickets
United Airlines
Aug 29
DCA7:00 pmWashington, D.C. Reagan-National
27h 40m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
Sep 7
SAI10:30 amSiem Reap–Angkor Intl
47h 00m
2 stops
DCA10:30 pmWashington, D.C. Reagan-National
$4,314
United Airlines
Jan 17
DCA12:40 pmWashington, D.C. Reagan-National
39h 15m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Jan 27
SAI10:45 amSiem Reap–Angkor Intl
47h 08m
2 stops
DCA9:53 pmWashington, D.C. Reagan-National
$7,098

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
Jan 17
DCA9:30 amWashington, D.C. Reagan-National
42h 25m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Jan 27
SAI10:45 amSiem Reap–Angkor Intl
45h 15m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,436
Singapore Airlines
Nov 7
DCA9:30 amWashington, D.C. Reagan-National
42h 25m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Nov 14
SAI10:45 amSiem Reap–Angkor Intl
45h 15m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,836
Singapore Airlines
Sep 28
DCA9:30 amWashington, D.C. Reagan-National
42h 40m
3 stops
SAI3:10 pmSiem Reap–Angkor Intl
Oct 4
SAI10:30 amSiem Reap–Angkor Intl
44h 30m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$2,836

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 August 7, 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 Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sun 1/17

9:30 am-3:55 pm

2 stops42h 25m

Siem Reap–Angkor Intl

Wed 1/27

10:45 am-8:00 pm

2 stops45h 15m

$1,436

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sun 1/17

6:00 am-9:50 am

3 stops39h 50m

Siem Reap–Angkor Intl

Wed 1/27

4:45 pm-10:59 pm

3 stops42h 14m

$1,502

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sat 11/7

6:25 am-9:50 am

3 stops39h 25m

Siem Reap–Angkor Intl

Sat 11/14

4:45 pm-10:48 pm

3 stops42h 03m

$1,613

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sat 11/7

9:30 am-3:55 pm

2 stops42h 25m

Siem Reap–Angkor Intl

Sat 11/14

10:45 am-8:00 pm

2 stops45h 15m

$1,836

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Tue 10/20

6:57 pm-3:10 pm

2 stops57h 13m

Siem Reap–Angkor Intl

Fri 10/30

10:45 am-8:00 pm

2 stops44h 15m

$1,867

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sat 11/7

9:30 am-3:55 pm

2 stops42h 25m

Siem Reap–Angkor Intl

Sat 11/14

10:45 am-8:00 pm

2 stops45h 15m

$1,896

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Mon 9/28

9:30 am-3:10 pm

3 stops42h 40m

Siem Reap–Angkor Intl

Sun 10/4

10:30 am-8:00 pm

2 stops44h 30m

$2,836

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Mon 9/28

9:30 am-3:10 pm

2 stops42h 40m

Siem Reap–Angkor Intl

Sun 10/4

4:00 pm-8:00 pm

2 stops39h 00m

$3,032
Quickest round-trip

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sat 12/26

4:00 pm-8:45 am

3 stops28h 45m

Siem Reap–Angkor Intl

Sat 1/2

9:50 am-8:58 am

3 stops35h 08m

$3,350

Washington, D.C.Siem Reap

DCA Washington, D.C. Reagan-National - SAI Siem Reap–Angkor Intl

DCASAI

Washington, D.C. Reagan-National

Sat 8/29

7:00 pm-9:40 am

2 stops27h 40m

Siem Reap–Angkor Intl

Mon 9/7

10:30 am-10:30 pm

2 stops47h 00m

$4,314

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Washington, D.C. Reagan-National Airport to 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–Angkor Intl?

Singapore Airlines is the most popular carrier operating from Washington, D.C. Reagan-National to Siem Reap–Angkor Intl

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

27h 40m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Siem Reap takes 27h 40m
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.
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Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Siem Reap

  • 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 27h 40m, 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.

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.

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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