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Cheap flights from Washington to Siem Reap from $419

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 to Siem Reap departing on 3/12. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$556Singapore Airlines
Thu, May 7 - Thu, May 28
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$742Singapore Airlines
Thu, May 14 - Thu, May 28
Singapore Airlines Logo
4:28 pm - 9:40 am
SEA
-
SAI
27h 12m
2 stops
Singapore Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$761Singapore Airlines
Wed, May 13 - Thu, May 28
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 10:00 am
SAI
-
SEA
37h 30m
2 stops
$819Singapore Airlines
Thu, May 7 - Thu, May 28
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 11:01 am
SAI
-
SEA
38h 31m
2 stops
$860Singapore Airlines
Thu, May 14 - Thu, May 28
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 10:00 am
SAI
-
SEA
37h 30m
2 stops
$901Singapore Airlines
Sat, May 2 - Sat, May 16
Singapore Airlines Logo
2:25 pm - 9:40 am
SEA
-
SAI
29h 15m
2 stops
Singapore Airlines Logo
4:00 pm - 8:45 am
SAI
-
SEA
30h 45m
1 stop
$902Singapore Airlines
Wed, May 13 - Wed, May 27
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
60h 15m
1 stop
$917Singapore Airlines
Thu, May 14 - Thu, May 28
Multiple Airlines Logo
1:15 am - 6:45 pm
SEA
-
SAI
27h 30m
2 stops
Multiple Airlines Logo
9:40 am - 4:10 pm
SAI
-
SEA
20h 30m
2 stops
$924Multiple Airlines
Tue, May 5 - Thu, May 28
Singapore Airlines Logo
2:25 pm - 9:40 am
SEA
-
SAI
29h 15m
2 stops
Singapore Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$931Singapore Airlines
Wed, May 13 - Wed, May 27

Singapore Airlines flights from State of Washington to Siem Reap

Our best Singapore Airlines deals on State of Washington to Siem Reap flight tickets
Singapore Airlines
May 7
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
May 28
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$556
Singapore Airlines
May 14
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
May 28
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$742
Singapore Airlines
May 13
SEA4:28 pmSeattle/Tacoma Intl
27h 12m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 28
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$761

United Airlines flights from State of Washington to Siem Reap

Our best United Airlines deals on State of Washington to Siem Reap flight tickets
United Airlines
May 4
SEA8:38 amSeattle/Tacoma Intl
35h 02m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 25
SAI10:30 amSiem Reap–Angkor Intl
43h 50m
2 stops
SEA4:20 pmSeattle/Tacoma Intl
$1,049
United Airlines
May 8
SEA8:38 amSeattle/Tacoma Intl
59h 02m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 25
SAI10:30 amSiem Reap–Angkor Intl
42h 00m
2 stops
SEA2:30 pmSeattle/Tacoma Intl
$1,056
United Airlines
Mar 5
PDX1:30 pmPortland
53h 20m
2 stops
SAI9:50 amSiem Reap–Angkor Intl
Mar 11
SAI10:45 amSiem Reap–Angkor Intl
50h 19m
2 stops
PDX11:04 pmPortland
$4,227

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 March 4, 2026.
Use the filters below to find and compare flights from Washington to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 5/7

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:45 am

1 stop36h 15m

$556

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 5/14

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:45 am

1 stop36h 15m

$742

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/13

4:28 pm-9:40 am

2 stops27h 12m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:45 am

1 stop36h 15m

$761

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 5/7

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-10:00 am

2 stops37h 30m

$819

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 5/14

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-11:01 am

2 stops38h 31m

$860

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 5/2

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Sat 5/16

10:30 am-10:00 am

2 stops37h 30m

$901

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/13

2:25 pm-9:40 am

2 stops29h 15m

Siem Reap–Angkor Intl

Wed 5/27

4:00 pm-8:45 am

1 stop30h 45m

$902

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 5/14

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 5/28

10:30 am-8:45 am

1 stop60h 15m

$917

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Tue 5/5

1:15 am-6:45 pm

2 stops27h 30m

Siem Reap–Angkor Intl

Thu 5/28

9:40 am-4:10 pm

2 stops20h 30m

$924

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/13

2:25 pm-9:40 am

2 stops29h 15m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-8:45 am

1 stop36h 15m

$931

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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Cheap State of Washington to Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Siem Reap

Fastest flight time

28h 25m

Direct flights

None
The fastest flight from State of Washington to Siem Reap takes 28h 25m
There are no direct flights from State of Washington to Siem Reap. There are no popular flight routes from State of Washington to Siem Reap.
Search flight deals

  • When did momondo last update prices for flights from Washington to Siem Reap–Angkor Intl Airport?

    Prices for flights from Washington to Siem Reap–Angkor Intl Airport refresh daily.

  • How many operators does momondo search for flights from Washington to Siem Reap–Angkor Intl Airport?

  • How old do you have to be to fly from Washington 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 to Siem Reap–Angkor Intl Airport.

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

    The required travel and health documents for your Siem Reap–Angkor Intl Airport 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–Angkor Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from State of Washington to Siem Reap

Compare and see reviews for airlines that fly from State of Washington to Siem Reap with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $523Free CancellationRating
8.2
1,465 reviews
Search Singapore Airlines flights

  • How do I get Price Alerts for flights from State of Washington to Siem Reap?

    Confirm your travel details to search for the latest offers for flights from State of Washington to Siem Reap. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from State of Washington 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?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Siem Reap?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington to Siem Reap for you.

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

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

How can momondo help me find flights from Washington to Siem Reap?

momondo helps you find the best flight between Washington 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 to Siem Reap right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington to Siem Reap flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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