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Cheap flights from Washington, D.C. to Siem Reap from $603

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. to Siem Reap departing on 7/10. 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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Find the cheapest flights from Washington, D.C. to Siem Reap

Cheap one-way flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
1:20 pm - 12:15 pm
IAD
-
SAI
59h 55m
2 stops
$603Multiple Airlines
Fri, Jul 10
Multiple Airlines Logo
8:20 pm - 11:10 am
IAD
-
SAI
51h 50m
3 stops
$628Multiple Airlines
Fri, Jul 10
Multiple Airlines Logo
8:59 pm - 6:05 pm
BWI
-
SAI
58h 06m
3 stops
$684Multiple Airlines
Fri, Jul 10
Multiple Airlines Logo
1:50 am - 6:45 pm
IAD
-
SAI
29h 55m
2 stops
$726Multiple Airlines
Wed, Jul 8
Multiple Airlines Logo
8:59 pm - 11:10 am
BWI
-
SAI
51h 11m
3 stops
$742Multiple Airlines
Thu, Jul 9
Singapore Airlines Logo
9:59 am - 3:10 pm
DCA
-
SAI
42h 11m
2 stops
$899Singapore Airlines
Fri, Jul 10
Singapore Airlines Logo
9:59 am - 9:40 am
DCA
-
SAI
36h 41m
3 stops
$912Singapore Airlines
Thu, Jul 9
Emirates Logo
10:55 am - 9:30 pm
IAD
-
SAI
47h 35m
2 stops
$1,140Emirates
Thu, Jul 9
EVA Air Logo
6:59 pm - 9:40 am
BWI
-
SAI
51h 41m
2 stops
$2,003EVA Air
Thu, Jul 9
Asiana Airlines Logo
1:00 pm - 9:40 am
DCA
-
SAI
57h 40m
2 stops
$2,931Asiana Airlines
Thu, Jul 9

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 24, 2026.
Use the filters below to find and compare flights from Washington, D.C. 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

Fri 7/10

1:20 pm-12:15 pm

2 stops59h 55m

$603

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Fri 7/10

8:20 pm-11:10 am

3 stops51h 50m

$628

BaltimoreSiem Reap

BWI - SAI

BWISAI

Baltimore/Washington

Fri 7/10

8:59 pm-6:05 pm

3 stops58h 06m

$684

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 7/8

1:50 am-6:45 pm

2 stops29h 55m

$726

BaltimoreSiem Reap

BWI - SAI

BWISAI

Baltimore/Washington

Thu 7/9

8:59 pm-11:10 am

3 stops51h 11m

$742

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Fri 7/10

9:59 am-3:10 pm

2 stops42h 11m

$899

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 7/9

9:59 am-9:40 am

3 stops36h 41m

$912

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

$1,140

BaltimoreSiem Reap

BWI - SAI

BWISAI

Baltimore/Washington

Thu 7/9

6:59 pm-9:40 am

2 stops51h 41m

$2,003

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 7/9

1:00 pm-9:40 am

2 stops57h 40m

$2,931

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. 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. to Siem Reap?

Singapore Airlines, Emirates, and EVA Air are the most popular carriers operating from Washington, D.C. to Siem Reap

Cheap Washington, D.C. 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. to Region of Siem Reap

Fastest flight time

27h 30m

Direct flights

None
The fastest flight from Washington, D.C. to Region of Siem Reap takes 27h 30m
There are no direct flights from Washington, D.C. to Region of Siem Reap. There are no popular flight routes from Washington, D.C. to Region of Siem Reap.
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  • When did momondo last update prices for flights from Washington, D.C. to Siem Reap?

    Prices for flights from Washington, D.C. to Siem Reap are refreshed on a daily basis.

  • How old do you have to be to fly from Washington, D.C. to Siem Reap?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Siem Reap.

  • What documentation or ID do you need to fly to Siem Reap?

    The required travel and health documents for your Siem Reap 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. 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 Washington, D.C. to Siem Reap?

It is quick and easy to find Washington, D.C. to Siem Reap flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Siem Reap that suits you.

Can I find flights from Washington, D.C. to Siem Reap with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Siem Reap from Washington, D.C. with this policy.

How can momondo help me find flights from Washington, D.C. to Siem Reap?

momondo helps you find the best flight between Washington, D.C. and Siem Reap by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Washington, D.C. to Siem Reap right now. Can momondo alert me if prices change?

Price alerts on flights to Siem Reap from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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