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Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $1,758

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 5/5. 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.
Emirates Logo
5:00 pm - 9:30 pm
DCA
-
SAI
41h 30m
3 stops
Emirates Logo
11:50 pm - 10:47 pm
SAI
-
DCA
33h 57m
3 stops
$1,758Emirates
Tue, May 5 - Tue, May 12
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
2 stops
Singapore Airlines Logo
10:30 am - 8:06 pm
SAI
-
DCA
44h 36m
2 stops
$2,250Singapore Airlines
Sun, May 17 - Sun, May 24
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
Singapore Airlines Logo
4:00 pm - 8:06 pm
SAI
-
DCA
39h 06m
2 stops
$2,685Singapore Airlines
Sun, May 17 - Sun, May 24
Emirates Logo
5:00 pm - 9:30 pm
DCA
-
SAI
41h 30m
3 stops
Emirates Logo
11:50 pm - 10:26 pm
SAI
-
DCA
33h 36m
3 stops
$2,753Emirates
Thu, Sep 24 - Tue, Oct 13
Multiple Airlines Logo
5:40 pm - 12:20 pm
DCA
-
SAI
31h 40m
3 stops
Multiple Airlines Logo
10:35 pm - 7:58 pm
SAI
-
DCA
32h 23m
3 stops
$4,051Multiple Airlines
Sun, May 17 - Sun, May 24

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
May 17
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 24
SAI10:30 amSiem Reap–Angkor Intl
44h 36m
2 stops
DCA8:06 pmWashington, D.C. Reagan-National
$2,250
Singapore Airlines
May 17
DCA9:59 amWashington, D.C. Reagan-National
36h 41m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
May 24
SAI4:00 pmSiem Reap–Angkor Intl
39h 06m
2 stops
DCA8:06 pmWashington, D.C. Reagan-National
$2,685

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

Our best Emirates deals on Washington, D.C. Reagan-National Airport to Region of Siem Reap flight tickets
Emirates
May 5
DCA5:00 pmWashington, D.C. Reagan-National
41h 30m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
May 12
SAI11:50 pmSiem Reap–Angkor Intl
33h 57m
3 stops
DCA10:47 pmWashington, D.C. Reagan-National
$1,758
Emirates
Sep 24
DCA5:00 pmWashington, D.C. Reagan-National
41h 30m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
Oct 13
SAI11:50 pmSiem Reap–Angkor Intl
33h 36m
3 stops
DCA10:26 pmWashington, D.C. Reagan-National
$2,753

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 April 6, 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

Tue 5/5

5:00 pm-9:30 pm

3 stops41h 30m

Siem Reap–Angkor Intl

Tue 5/12

11:50 pm-10:47 pm

3 stops33h 57m

$1,758

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sun 5/17

9:59 am-9:40 am

2 stops36h 41m

Siem Reap–Angkor Intl

Sun 5/24

10:30 am-8:06 pm

2 stops44h 36m

$2,250

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sun 5/17

9:59 am-9:40 am

3 stops36h 41m

Siem Reap–Angkor Intl

Sun 5/24

4:00 pm-8:06 pm

2 stops39h 06m

$2,685

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 9/24

5:00 pm-9:30 pm

3 stops41h 30m

Siem Reap–Angkor Intl

Tue 10/13

11:50 pm-10:26 pm

3 stops33h 36m

$2,753
Quickest round-trip

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sun 5/17

5:40 pm-12:20 pm

3 stops31h 40m

Siem Reap–Angkor Intl

Sun 5/24

10:35 pm-7:58 pm

3 stops32h 23m

$4,051
Cheapest one-way
Quickest one-way

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 5/8

6:00 am-9:30 pm

3 stops28h 30m

$1,789

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sat 5/9

6:00 am-9:55 pm

3 stops28h 55m

$1,796

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 5/8

5:59 pm-9:40 am

2 stops28h 41m

$2,471

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

41h 30m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Region of Siem Reap takes 41h 30m
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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