How long is the flight from Washington, D.C. Dulles Intl Airport to Siem Reap?

Emirates and Lufthansa can get you from Washington, D.C. Dulles Intl Airport to Siem Reap in just under 38h 20m. Your travel time can differ by up to 9h 15m. Airlines will cover a distance of 8814 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 10.2 inches per month. September is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 in.

If weather is an important factor for your trip to Siem Reap, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 75.2 F).

What is the cheapest time of day to fly from IAD to SAI?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Siem Reap as you normally would.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Siem Reap flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Siem Reap flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Siem Reap flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Siem Reap flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Siem Reap from Washington, D.C. Dulles Intl?

Siem Reap–Angkor Intl (SAI), located 24.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to Siem Reap. 0 airlines have flights to Siem Reap–Angkor Intl from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to Siem Reap–Angkor Intl should not be difficult; the airport handles an average of 0 inbound flights from Washington, D.C. Dulles Intl per day.

Can I find deals for flights from Dulles Intl to Siem Reap that include hotel bookings?

Yes. In addition to deals on Dulles Intl to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Dulles Intl to Siem Reap?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Siem Reap.

Can I find deals for business class flights from Dulles Intl to Siem Reap?

Yes. Cheapflights offers flight deals from Dulles Intl to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$720+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Siem Reap, Cambodia

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Cheap flight deals from Dulles Intl to Siem Reap

Cheapest

Best

Last-minute

One-way

Cheapest flights from Dulles Intl to Siem Reap
Explore the most affordable flight options available from Dulles Intl to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Sun 10/1110:55 am -

2 stops47h 35m

Tue 10/2011:50 pm -

2 stops43h 50m

Deal found 9/4

$1,215

Fri 10/212:15 pm -

2 stops43h 05m

Sat 10/177:10 pm -

2 stops25h 55m

Deal found 9/6

$1,246

Sun 10/1110:20 pm -

3 stops33h 35m

Tue 10/2010:30 am -

2 stops41h 15m

Deal found 9/4

$1,459

Sun 10/115:35 pm -

3 stops38h 20m

Tue 10/207:35 pm -

2 stops34h 50m

Deal found 9/4

$1,504

Tue 12/1512:20 pm -

2 stops32h 55m

Thu 1/71:20 pm -

2 stops38h 20m

Deal found 9/6

$2,278

Mon 12/1411:55 pm -

2 stops30h 50m

Fri 1/89:55 am -

2 stops23h 00m

Deal found 9/6

$2,319

Mon 12/1411:55 pm -

2 stops30h 50m

Wed 1/69:55 am -

2 stops23h 00m

Deal found 9/6

$2,390

Mon 12/1411:55 pm -

2 stops28h 05m

Sat 1/99:55 am -

2 stops23h 00m

Deal found 9/6

$2,407

Sun 12/1310:30 am -

2 stops46h 40m

Sat 1/911:50 pm -

2 stops44h 20m

Deal found 9/6

$2,419

Best flights from Dulles Intl to Siem Reap
Discover carefully curated flight deals from Dulles Intl to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Sun 10/1110:55 am -

2 stops47h 35m

Tue 10/2011:50 pm -

2 stops43h 50m

Deal found 9/4

$1,215

Mon 2/811:55 pm -

2 stops30h 50m

Fri 2/199:55 am -

2 stops23h 00m

Deal found 9/2

$1,293

Sun 10/115:35 pm -

3 stops38h 20m

Tue 10/207:35 pm -

2 stops34h 50m

Deal found 9/4

$1,504

Sun 12/138:05 pm -

2 stops25h 10m

Sun 1/101:20 pm -

2 stops38h 35m

Deal found 9/6

$2,499

Sun 10/1110:20 pm -

3 stops33h 35m

Tue 10/2010:30 am -

2 stops41h 15m

Deal found 9/4

$1,459

Sat 12/128:05 pm -

2 stops49h 10m

Thu 1/79:55 am -

2 stops34h 35m

Deal found 9/6

$2,594

Fri 12/1810:30 am -

2 stops62h 10m

Sat 1/911:50 pm -

2 stops44h 20m

Deal found 9/6

$2,789

Sat 12/128:05 pm -

2 stops49h 10m

Wed 1/69:55 am -

2 stops42h 00m

Deal found 9/6

$2,594

Sat 12/128:05 pm -

2 stops49h 10m

Fri 1/87:25 pm -

2 stops32h 30m

Deal found 9/6

$2,753

Sat 1/161:30 pm -

2 stops31h 15m

Sun 1/317:25 pm -

2 stops28h 20m

Deal found 9/2

$6,542

Last-minute flights from Dulles Intl to Siem Reap
Discover last-minute flight deals from Dulles Intl to Siem Reap. Data last updated September 7, 2026 and is based on user searches.

Fri 10/212:15 pm -

2 stops43h 05m

Sat 10/177:10 pm -

2 stops25h 55m

Deal found 9/6

$1,246

Sun 10/1110:55 am -

2 stops47h 35m

Tue 10/2011:50 pm -

2 stops43h 50m

Deal found 9/4

$1,215

Sun 10/1110:20 pm -

3 stops33h 35m

Tue 10/2010:30 am -

2 stops41h 15m

Deal found 9/4

$1,459

Sun 10/115:35 pm -

3 stops38h 20m

Tue 10/207:35 pm -

2 stops34h 50m

Deal found 9/4

$1,504

Fri 10/231:15 pm -

2 stops32h 30m

Fri 10/307:25 pm -

2 stops36h 00m

Deal found 9/6

$7,743

One-way flights from Dulles Intl to Siem Reap
Search for one-way flight options from Dulles Intl to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Wed 10/149:00 pm -

2 stops28h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$720

Fri 12/118:10 pm -

3 stops56h 45m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$925

Sun 12/1311:35 pm -

2 stops45h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$943

Mon 12/148:10 pm -

3 stops56h 45m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$956

Tue 12/1511:10 am -

3 stops42h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$966

Sat 12/125:50 pm -

3 stops51h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$967

Wed 12/168:50 pm -

3 stops55h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/4

$1,099

Find flight deals from Dulles Intl to Siem Reap

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$1,215 (Emirates)
One-way from	$720 (Justfly.com)

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Siem Reap–Angkor Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Siem Reap–Angkor Intl flights.

Search Deals

From Washington, D.C. Dulles Intl to Siem Reap–Angkor Intl

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Siem Reap–Angkor Intl

Search Deals

Cheapflights Fare Finder

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

Quickest round-trip

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Wed 10/14

9:00 pm-12:15 pm

2 stops28h 15m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$720

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Wed 10/14

9:00 pm-4:25 pm

3 stops32h 25m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$737

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Fri 12/11

8:10 pm-4:55 pm

3 stops56h 45m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$925

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Sun 12/13

11:35 pm-8:45 am

2 stops45h 10m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$943

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Mon 12/14

8:10 pm-4:55 pm

3 stops56h 45m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$956

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Wed 12/16

8:50 pm-4:00 pm

3 stops55h 10m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$1,099

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Tue 12/15

11:10 am-3:00 pm

2 stops39h 50m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$1,108

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Sun 10/11

10:55 am-9:30 pm

2 stops47h 35m

Siem Reap–Angkor Intl

Tue 10/20

11:50 pm-8:40 am

2 stops43h 50m

$1,215

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Mon 2/8

11:55 pm-6:45 pm

2 stops30h 50m

Siem Reap–Angkor Intl

Fri 2/19

9:55 am-8:55 pm

2 stops23h 00m

$1,293

Washington, D.C.Siem Reap

IAD Washington, D.C. Dulles Intl - SAI Siem Reap–Angkor Intl

IADSAI

Washington, D.C. Dulles Intl

Fri 12/18

5:50 pm-9:55 am

3 stops52h 05m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 pm

Nonstop0h 00m

$1,450

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/6

Showing 1-10 of 18 resultsSorted by cheapest first

Compare providers for flights from Dulles Intl to Siem Reap

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Siem Reap in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Siem Reap flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Siem Reap flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Siem Reap flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Siem Reap flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Dulles Intl with our price prediction graph.

IAD-SAI

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

What airport do you fly into for flights to Siem Reap from Washington, D.C. Dulles Intl?
Siem Reap–Angkor Intl (SAI), located 24.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to Siem Reap. 0 airlines have flights to Siem Reap–Angkor Intl from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to Siem Reap–Angkor Intl should not be difficult; the airport handles an average of 0 inbound flights from Washington, D.C. Dulles Intl per day.
How long is the flight from Washington, D.C. Dulles Intl Airport to Siem Reap?
Emirates and Lufthansa can get you from Washington, D.C. Dulles Intl Airport to Siem Reap in just under 38h 20m. Your travel time can differ by up to 9h 15m. Airlines will cover a distance of 8814 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
Can I find deals for flights from Dulles Intl to Siem Reap that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Siem Reap.
Can I find deals for business class flights from Dulles Intl to Siem Reap?
Yes. Cheapflights offers flight deals from Dulles Intl to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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$720+ Cheap flights from Dulles Intl (IAD) to Siem Reap, Cambodia (SAI)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Siem Reap with Cheapflights

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Cheap flight deals from Dulles Intl to Siem Reap

Cheapest flights from Dulles Intl to Siem ReapExplore the most affordable flight options available from Dulles Intl to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Explore the most affordable flight options available from Dulles Intl to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Best flights from Dulles Intl to Siem ReapDiscover carefully curated flight deals from Dulles Intl to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Discover carefully curated flight deals from Dulles Intl to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Last-minute flights from Dulles Intl to Siem ReapDiscover last-minute flight deals from Dulles Intl to Siem Reap. Data last updated September 7, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Siem Reap. Data last updated September 7, 2026 and is based on user searches.

One-way flights from Dulles Intl to Siem ReapSearch for one-way flight options from Dulles Intl to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Search for one-way flight options from Dulles Intl to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Find flight deals from Dulles Intl to Siem Reap

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Most trusted provider

Round-trip from

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Siem Reap that are best for you.

Compare providers for flights from Dulles Intl to Siem Reap

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Siem Reap in September.

Best time to book a flight from Dulles Intl to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Dulles Intl with our price prediction graph.

Related info for your journey

What airport do you fly into for flights to Siem Reap from Washington, D.C. Dulles Intl?

How long is the flight from Washington, D.C. Dulles Intl Airport to Siem Reap?

Can I find deals for flights from Dulles Intl to Siem Reap that include hotel bookings?

How can I find direct flights from Dulles Intl to Siem Reap?

Can I find deals for business class flights from Dulles Intl to Siem Reap?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Siem Reap by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Dulles Intl to Siem Reap by cabin class

Find flights from Dulles Intl to Siem Reap, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Dulles Intl and Siem Reap flights

Browse other Dulles Intl and Siem Reap flight options. Last updated on September 7, 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on September 7, 2026.

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Cheapest flights from Dulles Intl to Siem Reap
Explore the most affordable flight options available from Dulles Intl to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Best flights from Dulles Intl to Siem Reap
Discover carefully curated flight deals from Dulles Intl to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Last-minute flights from Dulles Intl to Siem Reap
Discover last-minute flight deals from Dulles Intl to Siem Reap. Data last updated September 7, 2026 and is based on user searches.

One-way flights from Dulles Intl to Siem Reap
Search for one-way flight options from Dulles Intl to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.