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Cheap flights from Washington, D.C. Dulles Intl Airport to Siem Reap from $1,519

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. Dulles Intl Airport to Siem Reap departing on 7/16. 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 Washington, D.C. Dulles Intl Airport to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:10 pm - 11:15 am
IAD
-
SAI
33h 05m
2 stops
Multiple Airlines Logo
7:20 pm - 9:45 am
SAI
-
IAD
49h 25m
2 stops
$1,519Multiple Airlines
Thu, Jul 16 - Fri, Jul 31
Emirates Logo
2:53 pm - 9:30 pm
IAD
-
SAI
43h 37m
3 stops
Emirates Logo
12:55 pm - 8:40 am
SAI
-
IAD
54h 45m
2 stops
$1,963Emirates
Thu, Jul 16 - Fri, Jul 31
Multiple Airlines Logo
1:50 am - 6:40 pm
IAD
-
SAI
29h 50m
3 stops
Multiple Airlines Logo
3:10 pm - 11:35 am
SAI
-
IAD
31h 25m
3 stops
$2,794Multiple Airlines
Wed, Jul 15 - Fri, Jul 31

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 May 9, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl 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

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Thu 7/16

3:10 pm-11:15 am

2 stops33h 05m

Siem Reap–Angkor Intl

Fri 7/31

7:20 pm-9:45 am

2 stops49h 25m

$1,519

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Thu 7/16

2:53 pm-9:30 pm

3 stops43h 37m

Siem Reap–Angkor Intl

Fri 7/31

12:55 pm-8:40 am

2 stops54h 45m

$1,963
Quickest round-trip

Washington, D.C.Siem Reap

IAD - SAI

IADSAI

Washington, D.C. Dulles Intl

Wed 7/15

1:50 am-6:40 pm

3 stops29h 50m

Siem Reap–Angkor Intl

Fri 7/31

3:10 pm-11:35 am

3 stops31h 25m

$2,794

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Washington, D.C. Dulles Intl Airport to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to Siem Reap (IAD to SAI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Siem Reap

Fastest flight time

33h 05m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Siem Reap takes 33h 05m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Siem Reap. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Siem Reap.
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Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Siem Reap

  • How far is Washington, D.C. Dulles Intl to Siem Reap–Angkor Intl by plane?

    The distance between Washington, D.C. Dulles Intl and Siem Reap–Angkor Intl is about 8815.7 mi. A reasonable flight in good conditions will take 33h 05m.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Siem Reap–Angkor Intl Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to Siem Reap–Angkor Intl Airport are updated daily.

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Siem Reap–Angkor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Siem Reap–Angkor Intl Airport.

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

    The travel and health documents required for your trip to Siem Reap–Angkor Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap–Angkor Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Siem Reap

  • How do I get Price Alerts for flights from Washington, D.C. Dulles Intl Airport to Siem Reap?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Washington, D.C. Dulles Intl Airport from Siem Reap. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Washington, D.C. Dulles Intl Airport to 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?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Siem Reap?

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

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

Yes. momondo allows you to filter the results for Washington, D.C. to Siem Reap flights to just show those with flexible booking policies.

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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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