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Cheap flights from District of Columbia to Siem Reap from $507

This is the cheapest one-way 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 3/3. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
9:59 am - 3:55 pm
DCA
-
SAI
41h 56m
2 stops
Singapore Airlines Logo
10:45 am - 9:59 pm
SAI
-
DCA
47h 14m
2 stops
$1,287Singapore Airlines
Thu, Feb 26 - Thu, Mar 5
Multiple Airlines Logo
6:00 am - 9:50 am
DCA
-
SAI
39h 50m
3 stops
Multiple Airlines Logo
10:45 am - 9:59 pm
SAI
-
DCA
47h 14m
2 stops
$1,497Multiple Airlines
Thu, Feb 26 - Thu, Mar 5
Multiple Airlines Logo
9:45 pm - 9:00 am
IAD
-
SAI
24h 15m
2 stops
Multiple Airlines Logo
7:25 pm - 11:35 am
SAI
-
IAD
27h 10m
2 stops
$1,499Multiple Airlines
Tue, Jul 7 - Tue, Jul 28
Multiple Airlines Logo
9:45 pm - 9:00 am
IAD
-
SAI
24h 15m
2 stops
Multiple Airlines Logo
7:25 pm - 11:35 am
SAI
-
IAD
27h 10m
2 stops
$1,549Multiple Airlines
Tue, Jul 7 - Wed, Jul 29
Multiple Airlines Logo
10:40 am - 6:05 pm
IAD
-
SAI
43h 25m
2 stops
Multiple Airlines Logo
10:00 am - 8:20 am
SAI
-
IAD
58h 20m
2 stops
$1,564Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
Emirates Logo
10:55 am - 9:30 pm
IAD
-
SAI
47h 35m
2 stops
Emirates Logo
11:50 pm - 8:40 am
SAI
-
IAD
43h 50m
2 stops
$1,673Emirates
Sun, Jul 5 - Thu, Jul 30
Emirates Logo
10:55 am - 9:30 pm
IAD
-
SAI
47h 35m
2 stops
Emirates Logo
11:50 pm - 8:40 am
SAI
-
IAD
43h 50m
2 stops
$1,680Emirates
Sun, Jul 5 - Tue, Jul 28
Emirates Logo
10:55 am - 9:30 pm
IAD
-
SAI
47h 35m
2 stops
Emirates Logo
11:50 pm - 8:40 am
SAI
-
IAD
43h 50m
2 stops
$1,723Emirates
Sun, Jul 5 - Sat, Aug 1
Emirates Logo
10:55 am - 9:30 pm
IAD
-
SAI
47h 35m
2 stops
Emirates Logo
11:50 pm - 8:40 am
SAI
-
IAD
43h 50m
2 stops
$1,730Emirates
Thu, Jul 9 - Tue, Jul 28
Singapore Airlines Logo
9:59 am - 3:55 pm
DCA
-
SAI
41h 56m
2 stops
Singapore Airlines Logo
10:45 am - 8:00 pm
SAI
-
DCA
45h 15m
2 stops
$1,881Singapore Airlines
Fri, Jan 30 - Fri, Feb 6

Singapore Airlines flights from District of Columbia to Siem Reap

Our best Singapore Airlines deals on District of Columbia to Siem Reap flight tickets
Singapore Airlines
Feb 26
DCA9:59 amWashington, D.C. Reagan-National
41h 56m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 5
SAI10:45 amSiem Reap–Angkor Intl
47h 14m
2 stops
DCA9:59 pmWashington, D.C. Reagan-National
$1,287
Singapore Airlines
Jan 30
DCA9:59 amWashington, D.C. Reagan-National
41h 56m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Feb 6
SAI10:45 amSiem Reap–Angkor Intl
45h 15m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
$1,881

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 January 13, 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

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 2/26

9:59 am-3:55 pm

2 stops41h 56m

Siem Reap–Angkor Intl

Thu 3/5

10:45 am-9:59 pm

2 stops47h 14m

$1,287

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 2/26

6:00 am-9:50 am

3 stops39h 50m

Siem Reap–Angkor Intl

Thu 3/5

10:45 am-9:59 pm

2 stops47h 14m

$1,497

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Tue 7/7

9:45 pm-9:00 am

2 stops24h 15m

Siem Reap–Angkor Intl

Tue 7/28

7:25 pm-11:35 am

2 stops27h 10m

$1,499

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Tue 7/7

9:45 pm-9:00 am

2 stops24h 15m

Siem Reap–Angkor Intl

Wed 7/29

7:25 pm-11:35 am

2 stops27h 10m

$1,549

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Fri 1/30

10:40 am-6:05 pm

2 stops43h 25m

Siem Reap–Angkor Intl

Fri 2/6

10:00 am-8:20 am

2 stops58h 20m

$1,564

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sun 7/5

10:55 am-9:30 pm

2 stops47h 35m

Siem Reap–Angkor Intl

Thu 7/30

11:50 pm-8:40 am

2 stops43h 50m

$1,673

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sun 7/5

10:55 am-9:30 pm

2 stops47h 35m

Siem Reap–Angkor Intl

Tue 7/28

11:50 pm-8:40 am

2 stops43h 50m

$1,680

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sun 7/5

10:55 am-9:30 pm

2 stops47h 35m

Siem Reap–Angkor Intl

Sat 8/1

11:50 pm-8:40 am

2 stops43h 50m

$1,723

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Thu 7/9

10:55 am-9:30 pm

2 stops47h 35m

Siem Reap–Angkor Intl

Tue 7/28

11:50 pm-8:40 am

2 stops43h 50m

$1,730

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 1/30

9:59 am-3:55 pm

2 stops41h 56m

Siem Reap–Angkor Intl

Fri 2/6

10:45 am-8:00 pm

2 stops45h 15m

$1,881

Flights are sorted by cheapest round-trip flights first.

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See travel insights to Siem Reap from

How to get the cheapest flight ticket from District of Columbia 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 District of Columbia to Siem Reap–Angkor Intl?

United Airlines is the most popular carrier operating from District of Columbia to Siem Reap–Angkor Intl

Cheap District of Columbia to Siem Reap flight deals and tips

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

Fastest flight time

27h 30m

Direct flights

None
The fastest flight from District of Columbia to Siem Reap takes 27h 30m
There are no direct flights from District of Columbia to Siem Reap. There are no popular flight routes from District of Columbia to Siem Reap.
Search flight deals

  • When did momondo last update prices for flights from District of Columbia to Siem Reap–Angkor Intl Airport?

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

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

    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 District of Columbia to Siem Reap–Angkor Intl Airport.

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

    The required travel and health documents for your Siem Reap–Angkor Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from District of Columbia to Siem Reap?

Finding the right flight to Siem Reap from District of Columbia is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Siem Reap quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for District of Columbia to Siem Reap flights to just show those with flexible booking policies.

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

Once all potential District of Columbia to Siem Reap flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for District of Columbia to Siem Reap flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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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