In terms of precipitation, rainfall in Region of 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 Region of Siem Reap when rainfall is around 0.0 in.

If weather is an important factor for your trip to Region of 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 WA to SI?

When flying from State of Washington to Region of Siem Reap, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

How can I find direct flights from Washington to Siem Reap?

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

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

Yes. Cheapflights offers flight deals from Washington 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.

Find Cheap Flights from Washington to Siem Reap

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Cheap flight deals from Washington to Siem Reap

Popular in	December
Cheapest in	March

Highest demand for flights based on searches. 10% potential increase in price ($131 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($53 potential savings vs. average RT price).

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Reviews of airlines servicing Siem Reap

Read reviews from past customers who have flown Singapore Airlines from Washington to Siem Reap. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.1

Very good

1,367 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Singapore Airlines

8.1

Very good

1,367 reviews

Singapore Airlines

8.1

Very good

1,367 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Related info for your journey

Can I find deals for flights from Washington to Siem Reap that include hotel bookings?
Yes. In addition to deals on Washington to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Siem Reap.
Can I find deals for business class flights from Washington to Siem Reap?
Yes. Cheapflights offers flight deals from Washington 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.

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Washington to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Singapore Airlines	Cheapest$675	Average$1,149	FlexibilityNo cancel fee	On-time81%

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Find cheap flights from Washington to Siem Reap with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Washington to Siem Reap

Keep the following information in mind while searching for Washington to Siem Reap flight deals. Data was last updated septiembre 17, 2025.

Popular in

Cheapest in

Reviews of airlines servicing Siem Reap

Read reviews from past customers who have flown Singapore Airlines from Washington to Siem Reap. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

How can I find direct flights from Washington to Siem Reap?

Can I find deals for business class flights from Washington 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.

Alternative routes for Washington to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.

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 Washington to Siem Reap by cabin class

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

Washington and Siem Reap flights

Browse other Washington and Siem Reap flight options. Last updated on septiembre 17, 2025.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2025

Top airline flying from Washington to Siem Reap

100% Free

Book with Flexibility

Travel Smart

Cheap flights from Washington to Siem Reap

Find cheap flights from Washington to Siem Reap with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Washington to Siem Reap

Keep the following information in mind while searching for Washington to Siem Reap flight deals. Data was last updated septiembre 17, 2025.

Popular in

Cheapest in

Reviews of airlines servicing Siem Reap

Read reviews from past customers who have flown Singapore Airlines from Washington to Siem Reap. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

How can I find direct flights from Washington to Siem Reap?

Can I find deals for business class flights from Washington 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.

Alternative routes for Washington to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Washington to Siem Reap

100% Free

Book with Flexibility

Travel Smart