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Cheap flights from District of Columbia to Siem Reap from $523

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 9/2. 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 District of Columbia to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
1:15 am - 6:55 pm
IAD
-
SAI
30h 40m
2 stops
Multiple Airlines Logo
9:40 am - 10:00 pm
SAI
-
IAD
23h 20m
2 stops
$1,173Multiple Airlines
Wed, Sep 16 - Mon, Sep 21
Multiple Airlines Logo
1:15 am - 6:45 pm
IAD
-
SAI
30h 30m
2 stops
Multiple Airlines Logo
7:25 pm - 8:55 pm
SAI
-
IAD
37h 30m
2 stops
$1,210Multiple Airlines
Sat, Oct 24 - Sun, Nov 1
Multiple Airlines Logo
1:50 am - 6:55 pm
IAD
-
SAI
30h 05m
2 stops
Multiple Airlines Logo
9:40 am - 10:00 pm
SAI
-
IAD
23h 20m
2 stops
$1,347Multiple Airlines
Fri, Aug 28 - Sat, Sep 5
Multiple Airlines Logo
10:20 pm - 6:45 pm
IAD
-
SAI
33h 25m
2 stops
Multiple Airlines Logo
7:25 pm - 8:25 pm
SAI
-
IAD
37h 00m
2 stops
$1,355Multiple Airlines
Sun, Oct 25 - Sun, Nov 1
Multiple Airlines Logo
1:15 am - 4:10 pm
IAD
-
SAI
27h 55m
3 stops
Multiple Airlines Logo
7:25 pm - 8:55 pm
SAI
-
IAD
37h 30m
2 stops
$1,407Multiple Airlines
Sat, Oct 24 - Sun, Nov 1
Multiple Airlines Logo
3:10 pm - 11:10 am
IAD
-
SAI
33h 00m
2 stops
Multiple Airlines Logo
11:55 am - 9:45 am
SAI
-
IAD
56h 50m
2 stops
$1,421Multiple Airlines
Wed, Aug 19 - Wed, Aug 26
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
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

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ANA flights from District of Columbia to Siem Reap

Our best ANA deals on District of Columbia to Siem Reap flight tickets
ANA
Oct 25
IAD8:23 amWashington, D.C. Dulles Intl
45h 32m
3 stops
SAI4:55 pmSiem Reap–Angkor Intl
Nov 1
SAI6:40 pmSiem Reap–Angkor Intl
38h 33m
3 stops
IAD9:13 pmWashington, D.C. Dulles Intl
$1,679
ANA
Oct 25
IAD8:16 amWashington, D.C. Dulles Intl
45h 39m
3 stops
SAI4:55 pmSiem Reap–Angkor Intl
Nov 1
SAI6:40 pmSiem Reap–Angkor Intl
38h 24m
3 stops
IAD9:04 pmWashington, D.C. Dulles Intl
$1,715

Austrian Airlines flights from District of Columbia to Siem Reap

Our best Austrian Airlines deals on District of Columbia to Siem Reap flight tickets
Austrian Airlines
Dec 15
IAD6:10 pmWashington, D.C. Dulles Intl
51h 05m
2 stops
SAI9:15 amSiem Reap–Angkor Intl
Dec 31
SAI9:55 amSiem Reap–Angkor Intl
40h 15m
2 stops
IAD2:10 pmWashington, D.C. Dulles Intl
$1,998
Austrian Airlines
Dec 16
IAD6:10 pmWashington, D.C. Dulles Intl
36h 35m
2 stops
SAI6:45 pmSiem Reap–Angkor Intl
Dec 31
SAI9:55 amSiem Reap–Angkor Intl
40h 15m
2 stops
IAD2:10 pmWashington, D.C. Dulles Intl
$2,393
Austrian Airlines
Dec 17
IAD6:10 pmWashington, D.C. Dulles Intl
36h 35m
2 stops
SAI6:45 pmSiem Reap–Angkor Intl
Dec 31
SAI9:55 amSiem Reap–Angkor Intl
40h 15m
2 stops
IAD2:10 pmWashington, D.C. Dulles Intl
$2,663

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 July 25, 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

Cheapest round-trip

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 9/16

1:15 am-6:55 pm

2 stops30h 40m

Siem Reap–Angkor Intl

Mon 9/21

9:40 am-10:00 pm

2 stops23h 20m

$1,173

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sat 10/24

1:15 am-6:45 pm

2 stops30h 30m

Siem Reap–Angkor Intl

Sun 11/1

7:25 pm-8:55 pm

2 stops37h 30m

$1,210
Quickest round-trip

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Fri 8/28

1:50 am-6:55 pm

2 stops30h 05m

Siem Reap–Angkor Intl

Sat 9/5

9:40 am-10:00 pm

2 stops23h 20m

$1,347

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sun 10/25

10:20 pm-6:45 pm

2 stops33h 25m

Siem Reap–Angkor Intl

Sun 11/1

7:25 pm-8:25 pm

2 stops37h 00m

$1,355

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Sat 10/24

1:15 am-4:10 pm

3 stops27h 55m

Siem Reap–Angkor Intl

Sun 11/1

7:25 pm-8:55 pm

2 stops37h 30m

$1,407

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 8/19

3:10 pm-11:10 am

2 stops33h 00m

Siem Reap–Angkor Intl

Wed 8/26

11:55 am-9:45 am

2 stops56h 50m

$1,421

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

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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest 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?

Singapore Airlines and Qatar Airways are the most popular carriers 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

30h 40m

Direct flights

None
The fastest flight from District of Columbia to Siem Reap takes 30h 40m
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

Frequently asked questions about flying from District of Columbia to Siem Reap

  • 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