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Cheap flights from Washington to Siem Reap from $442

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 9/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Washington to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
8:45 am - 9:55 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
34h 10m1 stop Singapore Changi
Singapore Airlines Logo
10:45 am - 7:10 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
35h 25m1 stop Singapore Changi
$837Singapore Airlines
Tue, Dec 1 - Tue, Dec 22
Singapore Airlines Logo
8:45 am - 9:55 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
34h 10m1 stop Singapore Changi
Singapore Airlines Logo
10:45 am - 7:10 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
59h 25m1 stop Singapore Changi
$935Singapore Airlines
Wed, Jan 6 - Wed, Jan 27
Singapore Airlines Logo
8:45 am - 4:00 pmSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
40h 15m1 stop Singapore Changi
Singapore Airlines Logo
4:45 pm - 7:10 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
29h 25m1 stop Singapore Changi
$947Singapore Airlines
Sun, Dec 13 - Sat, Dec 26
Singapore Airlines Logo
10:15 am - 9:40 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
33h 25m1 stop Singapore Changi
Singapore Airlines Logo
10:30 am - 8:45 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
36h 15m1 stop Singapore Changi
$986Singapore Airlines
Thu, Sep 17 - Thu, Oct 1
Multiple Airlines Logo
4:30 pm - 9:00 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
26h 30m2 stops Tokyo Haneda Bangkok Suvarnabhumi
Multiple Airlines Logo
7:10 pm - 2:25 pmSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
33h 15m2 stops Ho Chi Minh City Tokyo Haneda
$1,016Multiple Airlines
Sat, Oct 10 - Fri, Oct 16
Multiple Airlines Logo
8:45 am - 4:00 pmSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
40h 15m1 stop Singapore Changi
Multiple Airlines Logo
4:45 pm - 7:05 pmSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
41h 20m2 stops Singapore Changi San Francisco
$1,037Multiple Airlines
Wed, Jan 6 - Wed, Jan 27
Singapore Airlines Logo
8:45 am - 4:00 pmSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
40h 15m1 stop Singapore Changi
Singapore Airlines Logo
4:45 pm - 7:10 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
53h 25m1 stop Singapore Changi
$1,064Singapore Airlines
Wed, Dec 23 - Wed, Jan 13
Multiple Airlines Logo
3:45 pm - 9:15 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
26h 30m2 stops Tokyo Haneda Bangkok Suvarnabhumi
Multiple Airlines Logo
10:45 am - 12:33 amSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
28h 48m2 stops Singapore Changi San Francisco
$1,068Multiple Airlines
Wed, Jan 6 - Wed, Jan 27
Multiple Airlines Logo
4:30 pm - 9:00 amSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
26h 30m2 stops Tokyo Haneda Bangkok Suvarnabhumi
Multiple Airlines Logo
7:35 pm - 2:25 pmSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
32h 50m2 stops Bangkok Suvarnabhumi Tokyo Haneda
$1,079Multiple Airlines
Tue, Sep 8 - Mon, Sep 21
Multiple Airlines Logo
1:30 am - 6:55 pmSEA  Seattle/Tacoma Intl-SAI Siem Reap–Angkor Intl
27h 25m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
12:55 pm - 7:20 pmSAI  Siem Reap–Angkor Intl-SEA Seattle/Tacoma Intl
20h 25m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,083Multiple Airlines
Wed, Sep 16 - Thu, Oct 1

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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
Dec 1
SEA8:45 amSeattle/Tacoma Intl
34h 10m
1 stop
SAI9:55 amSiem Reap–Angkor Intl
Dec 22
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$837
Singapore Airlines
Dec 13
SEA8:45 amSeattle/Tacoma Intl
40h 15m
1 stop
SAI4:00 pmSiem Reap–Angkor Intl
Dec 26
SAI4:45 pmSiem Reap–Angkor Intl
29h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$947
Singapore Airlines
Sep 17
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 1
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$986

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 August 10, 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

Cheapest round-trip

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Tue 12/1

8:45 am-9:55 am

1 stop34h 10m

Siem Reap–Angkor Intl

Tue 12/22

10:45 am-7:10 am

1 stop35h 25m

$837

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Wed 1/6

8:45 am-9:55 am

1 stop34h 10m

Siem Reap–Angkor Intl

Wed 1/27

10:45 am-7:10 am

1 stop59h 25m

$935

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Sun 12/13

8:45 am-4:00 pm

1 stop40h 15m

Siem Reap–Angkor Intl

Sat 12/26

4:45 pm-7:10 am

1 stop29h 25m

$947

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Thu 9/17

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 10/1

10:30 am-8:45 am

1 stop36h 15m

$986

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Sat 10/10

4:30 pm-9:00 am

2 stops26h 30m

Siem Reap–Angkor Intl

Fri 10/16

7:10 pm-2:25 pm

2 stops33h 15m

$1,016

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Wed 1/6

8:45 am-4:00 pm

1 stop40h 15m

Siem Reap–Angkor Intl

Wed 1/27

4:45 pm-7:05 pm

2 stops41h 20m

$1,037

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Wed 12/23

8:45 am-4:00 pm

1 stop40h 15m

Siem Reap–Angkor Intl

Wed 1/13

4:45 pm-7:10 am

1 stop53h 25m

$1,064

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Wed 1/6

3:45 pm-9:15 am

2 stops26h 30m

Siem Reap–Angkor Intl

Wed 1/27

10:45 am-12:33 am

2 stops28h 48m

$1,068

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Tue 9/8

4:30 pm-9:00 am

2 stops26h 30m

Siem Reap–Angkor Intl

Mon 9/21

7:35 pm-2:25 pm

2 stops32h 50m

$1,079
Quickest round-trip

SeattleSiem Reap

SEA Seattle/Tacoma Intl - SAI Siem Reap–Angkor Intl

SEASAI

Seattle/Tacoma Intl

Wed 9/16

1:30 am-6:55 pm

2 stops27h 25m

Siem Reap–Angkor Intl

Thu 10/1

12:55 pm-7:20 pm

2 stops20h 25m

$1,083

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Siem Reap from

How to get the cheapest flight ticket from State of Washington 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 to Siem Reap–Angkor Intl?

Singapore Airlines and Vietnam Airlines are the most popular carriers operating from Washington to Siem Reap–Angkor Intl

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

21h 30m

Direct flights

None
The fastest flight from State of Washington to Siem Reap takes 21h 30m
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.
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Frequently asked questions about flying from Washington to Siem Reap

  • 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 $543Free CancellationRating
8.2
1,584 reviews
Search Singapore Airlines flights

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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