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Cheap flights from District of Columbia to Siem Reap from $1,199

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from District of Columbia to Siem Reap departing on 3/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from District of Columbia to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:35 pm - 8:55 pm
IAD
-
SAI
42h 20m
2 stops
Multiple Airlines Logo
7:10 pm - 9:45 am
SAI
-
IAD
49h 35m
2 stops
$1,199Multiple Airlines
Wed, Mar 18 - Sun, Mar 29
Singapore Airlines Logo
9:59 am - 3:10 pm
DCA
-
SAI
42h 11m
2 stops
Singapore Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$1,788Singapore Airlines
Fri, Apr 3 - Fri, Apr 10
Multiple Airlines Logo
3:35 pm - 11:00 am
IAD
-
SAI
32h 25m
3 stops
Multiple Airlines Logo
7:30 pm - 8:40 am
SAI
-
IAD
48h 10m
2 stops
$1,818Multiple Airlines
Wed, Mar 18 - Sun, Mar 29
Multiple Airlines Logo
3:35 pm - 11:00 am
IAD
-
SAI
32h 25m
3 stops
Multiple Airlines Logo
3:35 pm - 3:40 pm
SAI
-
IAD
35h 05m
3 stops
$1,960Multiple Airlines
Wed, Mar 18 - Sun, Mar 29
Singapore Airlines Logo
9:59 am - 3:55 pm
DCA
-
SAI
42h 56m
2 stops
Singapore Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$2,024Singapore Airlines
Wed, Mar 18 - Sun, Mar 29
Multiple Airlines Logo
4:10 pm - 8:45 am
DCA
-
SAI
29h 35m
3 stops
Multiple Airlines Logo
10:35 pm - 10:43 pm
SAI
-
DCA
35h 08m
3 stops
$2,458Multiple Airlines
Wed, Mar 18 - Sun, Mar 29
Multiple Airlines Logo
5:00 pm - 1:15 pm
DCA
-
SAI
33h 15m
3 stops
Multiple Airlines Logo
4:00 pm - 7:53 pm
SAI
-
DCA
38h 53m
3 stops
$2,514Multiple Airlines
Fri, Apr 3 - Fri, Apr 10

Singapore Airlines flights from District of Columbia to Region of Siem Reap

Our best Singapore Airlines deals on District of Columbia to Region of Siem Reap flight tickets
Singapore Airlines
Apr 3
DCA9:59 amWashington, D.C. Reagan-National
42h 11m
2 stops
SAI3:10 pmSiem Reap–Angkor Intl
Apr 10
SAI10:30 amSiem Reap–Angkor Intl
44h 30m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,788
Singapore Airlines
Mar 18
DCA9:59 amWashington, D.C. Reagan-National
42h 56m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 29
SAI10:30 amSiem Reap–Angkor Intl
44h 30m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$2,024

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 February 21, 2026.
Use the filters below to find and compare flights from District of Columbia to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 3/18

3:35 pm-8:55 pm

2 stops42h 20m

Siem Reap–Angkor Intl

Sun 3/29

7:10 pm-9:45 am

2 stops49h 35m

$1,199

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 4/3

9:59 am-3:10 pm

2 stops42h 11m

Siem Reap–Angkor Intl

Fri 4/10

10:30 am-8:00 pm

2 stops44h 30m

$1,788

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 3/18

3:35 pm-11:00 am

3 stops32h 25m

Siem Reap–Angkor Intl

Sun 3/29

7:30 pm-8:40 am

2 stops48h 10m

$1,818

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 3/18

3:35 pm-11:00 am

3 stops32h 25m

Siem Reap–Angkor Intl

Sun 3/29

3:35 pm-3:40 pm

3 stops35h 05m

$1,960

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 3/18

9:59 am-3:55 pm

2 stops42h 56m

Siem Reap–Angkor Intl

Sun 3/29

10:30 am-8:00 pm

2 stops44h 30m

$2,024

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 3/18

4:10 pm-8:45 am

3 stops29h 35m

Siem Reap–Angkor Intl

Sun 3/29

10:35 pm-10:43 pm

3 stops35h 08m

$2,458

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 4/3

5:00 pm-1:15 pm

3 stops33h 15m

Siem Reap–Angkor Intl

Fri 4/10

4:00 pm-7:53 pm

3 stops38h 53m

$2,514

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap District of Columbia to Region of Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from District of Columbia to Region of Siem Reap

Fastest flight time

42h 11m

Direct flights

None
The fastest flight from District of Columbia to Region of Siem Reap takes 42h 11m
There are no direct flights from District of Columbia to Region of Siem Reap. There are no popular flight routes from District of Columbia to Region of Siem Reap.
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  • When did momondo last update prices for flights from District of Columbia to Siem Reap?

    Prices for flights from District of Columbia to Siem Reap are refreshed on a daily basis.

  • How old do you have to be to fly from District of Columbia to Siem Reap?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from District of Columbia 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.

  • How do I get Price Alerts for flights from District of Columbia to Region of Siem Reap?

    Price Alerts will notify you by email when the price for flights to Region of Siem Reap from District of Columbia decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from District of Columbia to Region of 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 District of Columbia to Siem Reap?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from District of Columbia to Siem Reap. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from District of Columbia to Siem Reap with flexible booking policies on momondo?

momondo does allow users to show only those flights to Siem Reap from District of Columbia which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from District of Columbia to Siem Reap?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Siem Reap from District of Columbia.

I’m not ready to book a flight from District of Columbia to Siem Reap right now. Can momondo alert me if prices change?

If you are not ready to book a flight from District of Columbia 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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Find better results for your trip to Siem Reap

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