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Cheap flights from Seattle to Siem Reap from $523

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 8/15. 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
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
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$697Singapore Airlines
Thu, Oct 1 - Sat, Oct 31
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
$797Singapore Airlines
Thu, Oct 8 - Mon, Oct 12
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$871Singapore Airlines
Thu, Oct 1 - Sat, Oct 31
Multiple Airlines Logo
9:28 pm - 9:40 am
SEA
-
SAI
46h 12m
2 stops
Multiple Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$1,006Multiple Airlines
Wed, Oct 21 - Wed, Oct 28
Multiple Airlines Logo
7:07 pm - 3:10 pm
SEA
-
SAI
30h 03m
2 stops
Multiple Airlines Logo
4:00 pm - 8:45 am
SAI
-
SEA
30h 45m
1 stop
$1,025Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Multiple Airlines Logo
10:30 am - 12:16 pm
SAI
-
SEA
39h 46m
2 stops
$1,030Multiple Airlines
Thu, Oct 8 - Mon, Oct 12
Multiple Airlines Logo
9:21 pm - 3:10 pm
SEA
-
SAI
51h 49m
2 stops
Multiple Airlines Logo
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$1,056Multiple Airlines
Thu, Oct 1 - Thu, Oct 15
Multiple Airlines Logo
9:25 pm - 9:40 am
SEA
-
SAI
46h 15m
2 stops
Multiple Airlines Logo
10:45 am - 8:10 am
SAI
-
SEA
35h 25m
1 stop
$1,057Multiple Airlines
Thu, Oct 1 - Sat, Oct 31
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
$1,064Singapore Airlines
Thu, Aug 27 - Mon, Sep 7
Multiple Airlines Logo
4:20 pm - 3:55 pm
SEA
-
SAI
32h 35m
2 stops
Multiple Airlines Logo
10:45 am - 7:10 am
SAI
-
SEA
35h 25m
1 stop
$1,075Multiple Airlines
Thu, Nov 12 - Thu, Nov 26

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
Oct 1
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 31
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$697
Singapore Airlines
Oct 8
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 12
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$797
Singapore Airlines
Oct 1
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 31
SAI10:45 amSiem Reap–Angkor Intl
35h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$871

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 May 21, 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

Cheapest round-trip

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/1

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Sat 10/31

10:45 am-8:10 am

1 stop35h 25m

$697

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/8

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Mon 10/12

10:30 am-8:45 am

1 stop36h 15m

$797

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/1

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Sat 10/31

10:45 am-8:10 am

1 stop35h 25m

$871

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 10/21

9:28 pm-9:40 am

2 stops46h 12m

Siem Reap–Angkor Intl

Wed 10/28

10:45 am-8:10 am

1 stop35h 25m

$1,006
Quickest round-trip

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 9/9

7:07 pm-3:10 pm

2 stops30h 03m

Siem Reap–Angkor Intl

Wed 9/16

4:00 pm-8:45 am

1 stop30h 45m

$1,025

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/8

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Mon 10/12

10:30 am-12:16 pm

2 stops39h 46m

$1,030

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/1

9:21 pm-3:10 pm

2 stops51h 49m

Siem Reap–Angkor Intl

Thu 10/15

10:30 am-8:45 am

1 stop36h 15m

$1,056

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 10/1

9:25 pm-9:40 am

2 stops46h 15m

Siem Reap–Angkor Intl

Sat 10/31

10:45 am-8:10 am

1 stop35h 25m

$1,057

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 8/27

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Mon 9/7

10:30 am-8:45 am

1 stop36h 15m

$1,064

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Thu 11/12

4:20 pm-3:55 pm

2 stops32h 35m

Siem Reap–Angkor Intl

Thu 11/26

10:45 am-7:10 am

1 stop35h 25m

$1,075

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

26h 30m

Direct flights

None
The fastest flight from Seattle to Region of Siem Reap takes 26h 30m
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.
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Frequently asked questions about flying from Seattle to Siem Reap

  • 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
1,522 reviews
Search Singapore Airlines flights

Frequently asked questions about flying from Seattle to Siem Reap

  • How do I get Price Alerts for flights from Seattle to Region of Siem Reap?

    Price Alerts will notify you by email when the price for flights to Region of Siem Reap from Seattle decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from Seattle to Region of Siem Reap with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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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