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Cheap flights from Washington, D.C. Reagan-National Airport to Siem Reap from $1,186

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. Reagan-National Airport to Siem Reap departing on 5/19. 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. Reagan-National Airport to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:30 am - 3:10 pm
DCA
-
SAI
42h 40m
2 stops
Multiple Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$1,542Multiple Airlines
Mon, Aug 31 - Mon, Sep 14
Multiple Airlines Logo
9:30 am - 3:10 pm
DCA
-
SAI
42h 40m
3 stops
Multiple Airlines Logo
10:30 am - 8:00 pm
SAI
-
DCA
44h 30m
2 stops
$1,761Multiple Airlines
Mon, Aug 31 - Mon, Sep 14
Emirates Logo
2:55 pm - 9:30 pm
DCA
-
SAI
43h 35m
3 stops
Emirates Logo
11:50 pm - 10:54 pm
SAI
-
DCA
34h 04m
3 stops
$2,514Emirates
Thu, Jun 4 - Thu, Jun 25
Emirates Logo
5:10 pm - 9:30 pm
DCA
-
SAI
41h 20m
3 stops
Emirates Logo
11:50 pm - 11:59 pm
SAI
-
DCA
35h 09m
3 stops
$2,602Emirates
Thu, Sep 3 - Tue, Sep 15

Emirates flights from Washington, D.C. Reagan-National Airport to Siem Reap

Our best Emirates deals on Washington, D.C. Reagan-National Airport to Siem Reap flight tickets
Emirates
Jun 4
DCA2:55 pmWashington, D.C. Reagan-National
43h 35m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
Jun 25
SAI11:50 pmSiem Reap–Angkor Intl
34h 04m
3 stops
DCA10:54 pmWashington, D.C. Reagan-National
$2,514
Emirates
Sep 3
DCA5:10 pmWashington, D.C. Reagan-National
41h 20m
3 stops
SAI9:30 pmSiem Reap–Angkor Intl
Sep 15
SAI11:50 pmSiem Reap–Angkor Intl
35h 09m
3 stops
DCA11:59 pmWashington, D.C. Reagan-National
$2,602

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National 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 14, 2026.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National 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

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 8/31

9:30 am-3:10 pm

2 stops42h 40m

Siem Reap–Angkor Intl

Mon 9/14

10:30 am-8:00 pm

2 stops44h 30m

$1,542

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 8/31

9:30 am-3:10 pm

3 stops42h 40m

Siem Reap–Angkor Intl

Mon 9/14

10:30 am-8:00 pm

2 stops44h 30m

$1,761

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 6/4

2:55 pm-9:30 pm

3 stops43h 35m

Siem Reap–Angkor Intl

Thu 6/25

11:50 pm-10:54 pm

3 stops34h 04m

$2,514
Quickest round-trip

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 9/3

5:10 pm-9:30 pm

3 stops41h 20m

Siem Reap–Angkor Intl

Tue 9/15

11:50 pm-11:59 pm

3 stops35h 09m

$2,602
Cheapest one-way

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 5/19

5:00 pm-9:15 am

3 stops53h 15m

$1,186

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Wed 5/20

5:00 pm-8:45 am

3 stops52h 45m

$1,300
Quickest one-way

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Sat 6/13

12:35 pm-11:10 am

3 stops35h 35m

$1,352

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Mon 5/18

5:00 pm-6:05 pm

3 stops38h 05m

$1,361

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Tue 6/16

6:40 pm-6:55 pm

3 stops61h 15m

$1,429

Washington, D.C.Siem Reap

DCA - SAI

DCASAI

Washington, D.C. Reagan-National

Thu 5/21

2:55 pm-9:30 pm

3 stops43h 35m

$2,405

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
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See travel insights to Siem Reap from

How to get the cheapest flight ticket from Washington, D.C. Reagan-National Airport 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 Washington, D.C. Reagan-National to Siem Reap–Angkor Intl?

Qatar Airways and Emirates are the most popular carriers operating from Washington, D.C. Reagan-National to Siem Reap–Angkor Intl

When to book flights from Washington, D.C. Reagan-National Airport to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Reagan-National 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. Reagan-National Airport to Siem Reap (DCA to SAI) flight deals and tips

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

Fastest flight time

42h 40m

Direct flights

None
The fastest flight from Washington, D.C. Reagan-National Airport to Siem Reap takes 42h 40m
There are no direct flights from Washington, D.C. Reagan-National Airport to Siem Reap. There are no popular flight routes from Washington, D.C. Reagan-National Airport to Siem Reap.
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Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Siem Reap

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

    Washington, D.C. Reagan-National and Siem Reap–Angkor Intl are 8822.8 mi apart from one another. Flights usually cover this in 42h 40m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Washington, D.C. Reagan-National Airport to Siem Reap–Angkor Intl Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. Reagan-National 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. Reagan-National 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.

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?

All flight searches from Washington, D.C. to Siem Reap on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to Siem Reap.

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

If you are not ready to book a flight from Washington, D.C. 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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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