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Cheap flights from Seattle to Siem Reap from $274

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Siem Reap departing on 4/10. 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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Find the cheapest flights from Seattle to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
9:45 am - 3:55 pm
SEA
-
SAI
40h 10m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$763Singapore Airlines
Sun, Mar 8 - Mon, Mar 23
Singapore Airlines Logo
8:45 am - 3:55 pm
SEA
-
SAI
40h 10m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$776Singapore Airlines
Thu, Mar 5 - Thu, Mar 12
Multiple Airlines Logo
11:38 am - 9:40 am
SEA
-
SAI
32h 02m
2 stops
Multiple Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$828Multiple Airlines
Wed, May 20 - Wed, May 27
Multiple Airlines Logo
11:38 am - 9:40 am
SEA
-
SAI
32h 02m
2 stops
Multiple Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$851Multiple Airlines
Wed, May 20 - Wed, May 27
Singapore Airlines Logo
8:45 am - 9:50 am
SEA
-
SAI
34h 05m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$880Singapore Airlines
Sat, Mar 7 - Mon, Mar 23
Singapore Airlines Logo
8:45 am - 3:55 pm
SEA
-
SAI
40h 10m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$916Singapore Airlines
Sat, Mar 7 - Wed, Mar 25
Singapore Airlines Logo
8:45 am - 9:50 am
SEA
-
SAI
34h 05m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$917Singapore Airlines
Fri, Mar 6 - Mon, Mar 23
Multiple Airlines Logo
8:45 am - 3:55 pm
SEA
-
SAI
40h 10m
1 stop
Multiple Airlines Logo
10:45 am - 9:31 am
SAI
-
SEA
36h 46m
2 stops
$961Multiple Airlines
Thu, Mar 5 - Thu, Mar 12
Multiple Airlines Logo
9:45 am - 9:50 am
SEA
-
SAI
34h 05m
1 stop
Multiple Airlines Logo
11:50 pm - 9:05 am
SAI
-
SEA
47h 15m
3 stops
$1,002Multiple Airlines
Sun, Mar 8 - Tue, Mar 24
Multiple Airlines Logo
4:12 pm - 9:40 am
SEA
-
SAI
27h 28m
2 stops
Multiple Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$1,012Multiple Airlines
Wed, May 27 - Wed, Jun 3

United Airlines flights from Seattle to Region of Siem Reap

Our best United Airlines deals on Seattle to Region of Siem Reap flight tickets
United Airlines
Feb 25
SEA5:05 amSeattle/Tacoma Intl
37h 45m
2 stops
SAI9:50 amSiem Reap–Angkor Intl
Mar 11
SAI10:45 amSiem Reap–Angkor Intl
43h 29m
2 stops
SEA4:14 pmSeattle/Tacoma Intl
$1,044
United Airlines
Feb 25
SEA7:29 pmSeattle/Tacoma Intl
53h 26m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 11
SAI10:45 amSiem Reap–Angkor Intl
48h 13m
2 stops
SEA8:58 pmSeattle/Tacoma Intl
$1,051
United Airlines
Mar 7
SEA9:20 amSeattle/Tacoma Intl
63h 35m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 25
SAI10:45 amSiem Reap–Angkor Intl
50h 43m
2 stops
SEA11:28 pmSeattle/Tacoma Intl
$1,091

Singapore Airlines flights from Seattle to Region of Siem Reap

Our best Singapore Airlines deals on Seattle to Region of Siem Reap flight tickets
Singapore Airlines
Mar 8
SEA9:45 amSeattle/Tacoma Intl
40h 10m
1 stop
SAI3:55 pmSiem Reap–Angkor Intl
Mar 23
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$763
Singapore Airlines
Mar 5
SEA8:45 amSeattle/Tacoma Intl
40h 10m
1 stop
SAI3:55 pmSiem Reap–Angkor Intl
Mar 12
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$776
Singapore Airlines
Mar 7
SEA8:45 amSeattle/Tacoma Intl
34h 05m
1 stop
SAI9:50 amSiem Reap–Angkor Intl
Mar 23
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$880

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Region of 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 February 12, 2026.
Use the filters below to find and compare flights from Seattle to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sun 3/8

9:45 am-3:55 pm

1 stop40h 10m

Siem Reap–Angkor Intl

Mon 3/23

10:45 am-8:10 am

1 stop35h 25m

$763

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 3/5

8:45 am-3:55 pm

1 stop40h 10m

Siem Reap–Angkor Intl

Thu 3/12

10:45 am-8:10 am

1 stop35h 25m

$776

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/20

11:38 am-9:40 am

2 stops32h 02m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-8:45 am

1 stop36h 15m

$828

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/20

11:38 am-9:40 am

2 stops32h 02m

Siem Reap–Angkor Intl

Wed 5/27

10:30 am-8:45 am

1 stop36h 15m

$851

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 3/7

8:45 am-9:50 am

1 stop34h 05m

Siem Reap–Angkor Intl

Mon 3/23

10:45 am-8:10 am

1 stop35h 25m

$880

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 3/7

8:45 am-3:55 pm

1 stop40h 10m

Siem Reap–Angkor Intl

Wed 3/25

10:45 am-8:10 am

1 stop35h 25m

$916

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Fri 3/6

8:45 am-9:50 am

1 stop34h 05m

Siem Reap–Angkor Intl

Mon 3/23

10:45 am-8:10 am

1 stop35h 25m

$917

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 3/5

8:45 am-3:55 pm

1 stop40h 10m

Siem Reap–Angkor Intl

Thu 3/12

10:45 am-9:31 am

2 stops36h 46m

$961

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sun 3/8

9:45 am-9:50 am

1 stop34h 05m

Siem Reap–Angkor Intl

Tue 3/24

11:50 pm-9:05 am

3 stops47h 15m

$1,002

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 5/27

4:12 pm-9:40 am

2 stops27h 28m

Siem Reap–Angkor Intl

Wed 6/3

10:30 am-8:45 am

1 stop36h 15m

$1,012

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 Seattle to Region of 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 Seattle/Tacoma Intl to Siem Reap?

Singapore Airlines is the most popular carrier operating from Seattle/Tacoma Intl to Siem Reap

Cheap Seattle to Region of Siem Reap flight deals and tips

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

Fastest flight time

32h 02m

Direct flights

None
The fastest flight from Seattle to Region of Siem Reap takes 32h 02m
There are no direct flights from Seattle to Region of Siem Reap. There are no popular flight routes from Seattle to Region of Siem Reap.
Search flight deals

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Siem Reap?

    Prices for flights from Seattle/Tacoma Intl Airport to Siem Reap refresh daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Siem Reap?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Siem Reap?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Siem Reap.

  • What documentation or ID do you need to fly to Siem Reap?

    The travel and health documents required for your trip to Siem Reap 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. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Seattle to Region of Siem Reap

Compare and see reviews for airlines that fly from Seattle to Region of Siem Reap with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $523Free CancellationRating
8.2
1,452 reviews
Search Singapore Airlines flights

Why use momondo?

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

It is quick and easy to find Seattle 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 Seattle to Siem Reap with flexible booking policies on momondo?

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

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

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

If you are not ready to book a flight from Seattle 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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Find better results for your trip to Siem Reap

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