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Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $775

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 11/4. 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 - 3:10 pm
DCA
-
SAI
42h 40m
2 stops
Singapore Airlines Logo
4:00 pm - 8:00 pm
SAI
-
DCA
39h 00m
2 stops
$1,688Singapore Airlines
Wed, Aug 19 - Wed, Aug 26
Singapore Airlines Logo
9:30 am - 3:10 pm
DCA
-
SAI
42h 40m
3 stops
Singapore Airlines Logo
4:00 pm - 8:00 pm
SAI
-
DCA
39h 00m
2 stops
$1,699Singapore Airlines
Wed, Aug 19 - Wed, Aug 26
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$1,794Singapore Airlines
Thu, Aug 13 - Wed, Aug 26
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$1,877Singapore Airlines
Tue, Aug 18 - Tue, Aug 25
Emirates Logo
5:10 pm - 9:30 pm
DCA
-
SAI
41h 20m
3 stops
Emirates Logo
11:50 pm - 11:59 pm
SAI
-
DCA
35h 09m
3 stops
$2,043Emirates
Tue, Aug 18 - Tue, Aug 25
Singapore Airlines Logo
9:30 am - 3:55 pm
DCA
-
SAI
42h 25m
2 stops
Singapore Airlines Logo
10:45 am - 8:00 pm
SAI
-
DCA
45h 15m
2 stops
$2,313Singapore Airlines
Mon, Jan 4 - Sat, Jan 9
Multiple Airlines Logo
6:59 pm - 9:50 am
DCA
-
SAI
50h 51m
2 stops
Multiple Airlines Logo
10:45 am - 8:00 pm
SAI
-
DCA
45h 15m
2 stops
$2,512Multiple Airlines
Mon, Dec 28 - Wed, Jan 6
United Airlines Logo
5:45 pm - 9:40 am
DCA
-
SAI
52h 55m
2 stops
United Airlines Logo
10:30 am - 10:30 pm
SAI
-
DCA
47h 00m
2 stops
$3,287United Airlines
Thu, Aug 13 - Wed, Aug 26
Multiple Airlines Logo
6:55 pm - 9:30 pm
DCA
-
SAI
63h 35m
3 stops
Multiple Airlines Logo
11:50 pm - 9:50 pm
SAI
-
DCA
57h 00m
3 stops
$6,920Multiple Airlines
Sat, Oct 3 - Sat, Oct 10
United Airlines Logo
12:49 pm - 3:55 pm
DCA
-
SAI
63h 06m
3 stops
United Airlines Logo
4:45 pm - 4:56 pm
SAI
-
DCA
36h 11m
2 stops
$7,165United Airlines
Mon, Jan 4 - Sat, Jan 9

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

Our best Singapore Airlines deals on Washington, D.C. Reagan-National Airport to Region of Siem Reap flight tickets
Singapore Airlines
Aug 19
DCA9:30 amWashington, D.C. Reagan-National
42h 40m
2 stops
SAI3:10 pmSiem Reap–Angkor Intl
Aug 26
SAI4:00 pmSiem Reap–Angkor Intl
39h 00m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,688
Singapore Airlines
Aug 19
DCA9:30 amWashington, D.C. Reagan-National
42h 40m
3 stops
SAI3:10 pmSiem Reap–Angkor Intl
Aug 26
SAI4:00 pmSiem Reap–Angkor Intl
39h 00m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,699
Singapore Airlines
Aug 13
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Aug 26
SAI10:30 amSiem Reap–Angkor Intl
44h 30m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,794

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

Our best United Airlines deals on Washington, D.C. Reagan-National Airport to Region of Siem Reap flight tickets
United Airlines
Aug 13
DCA5:45 pmWashington, D.C. Reagan-National
52h 55m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
Aug 26
SAI10:30 amSiem Reap–Angkor Intl
47h 00m
2 stops
DCA10:30 pmWashington, D.C. Reagan-National
$3,287
United Airlines
Jan 4
DCA12:49 pmWashington, D.C. Reagan-National
63h 06m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Jan 9
SAI4:45 pmSiem Reap–Angkor Intl
36h 11m
2 stops
DCA4:56 pmWashington, D.C. Reagan-National
$7,165
United Airlines
Aug 1
DCA12:59 pmWashington, D.C. Reagan-National
33h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Aug 7
SAI10:30 amSiem Reap–Angkor Intl
41h 17m
2 stops
DCA4:47 pmWashington, D.C. Reagan-National
$8,261

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 July 23, 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

Wed 8/19

9:30 am-3:10 pm

2 stops42h 40m

Siem Reap–Angkor Intl

Wed 8/26

4:00 pm-8:00 pm

2 stops39h 00m

$1,688

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 8/19

9:30 am-3:10 pm

3 stops42h 40m

Siem Reap–Angkor Intl

Wed 8/26

4:00 pm-8:00 pm

2 stops39h 00m

$1,699

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 8/13

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Wed 8/26

10:30 am-8:00 pm

2 stops44h 30m

$1,794

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 8/18

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Tue 8/25

10:30 am-8:00 pm

2 stops44h 30m

$1,877
Quickest round-trip

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 8/18

5:10 pm-9:30 pm

3 stops41h 20m

Siem Reap–Angkor Intl

Tue 8/25

11:50 pm-11:59 pm

3 stops35h 09m

$2,043

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 1/4

9:30 am-3:55 pm

2 stops42h 25m

Siem Reap–Angkor Intl

Sat 1/9

10:45 am-8:00 pm

2 stops45h 15m

$2,313

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 12/28

6:59 pm-9:50 am

2 stops50h 51m

Siem Reap–Angkor Intl

Wed 1/6

10:45 am-8:00 pm

2 stops45h 15m

$2,512

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 8/13

5:45 pm-9:40 am

2 stops52h 55m

Siem Reap–Angkor Intl

Wed 8/26

10:30 am-10:30 pm

2 stops47h 00m

$3,287

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sat 10/3

6:55 pm-9:30 pm

3 stops63h 35m

Siem Reap–Angkor Intl

Sat 10/10

11:50 pm-9:50 pm

3 stops57h 00m

$6,920

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 1/4

12:49 pm-3:55 pm

3 stops63h 06m

Siem Reap–Angkor Intl

Sat 1/9

4:45 pm-4:56 pm

2 stops36h 11m

$7,165

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

Singapore 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

42h 25m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Region of Siem Reap takes 42h 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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