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Cheap flights from Seattle to Siem Reap from $314

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 8/18. 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 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
10:30 am - 8:45 am
SAI
-
SEA
36h 15m
1 stop
$621Singapore Airlines
Tue, Sep 29 - Thu, Oct 15
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
4:00 pm - 8:45 am
SAI
-
SEA
30h 45m
1 stop
$776Singapore Airlines
Sat, Oct 10 - Fri, Oct 16
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
4:00 pm - 8:45 am
SAI
-
SEA
30h 45m
1 stop
$777Singapore Airlines
Tue, Sep 29 - Fri, Oct 16
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
$800Singapore Airlines
Sat, Sep 26 - Sat, Oct 17
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
4:00 pm - 8:45 am
SAI
-
SEA
30h 45m
1 stop
$804Singapore Airlines
Sat, Oct 10 - Fri, Oct 16
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
$821Singapore Airlines
Thu, Sep 17 - Thu, Oct 1
Singapore Airlines Logo
8:45 am - 9:50 am
SEA
-
SAI
34h 05m
1 stop
Singapore Airlines Logo
10:45 am - 7:10 am
SAI
-
SEA
35h 25m
1 stop
$835Singapore Airlines
Wed, Nov 25 - Sat, Dec 5
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 8:57 am
SAI
-
SEA
36h 27m
2 stops
$1,000Singapore Airlines
Tue, Sep 29 - Thu, Oct 15
Multiple Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Multiple Airlines Logo
7:10 pm - 8:45 am
SAI
-
SEA
51h 35m
2 stops
$1,065Multiple Airlines
Sun, Sep 27 - Wed, Oct 14
Singapore Airlines Logo
10:15 am - 9:40 am
SEA
-
SAI
33h 25m
1 stop
Singapore Airlines Logo
10:30 am - 11:24 am
SAI
-
SEA
38h 54m
2 stops
$1,071Singapore Airlines
Thu, Sep 17 - Thu, Oct 1

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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
Sep 29
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 15
SAI10:30 amSiem Reap–Angkor Intl
36h 15m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$621
Singapore Airlines
Oct 10
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 16
SAI4:00 pmSiem Reap–Angkor Intl
30h 45m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$776
Singapore Airlines
Sep 29
SEA10:15 amSeattle/Tacoma Intl
33h 25m
1 stop
SAI9:40 amSiem Reap–Angkor Intl
Oct 16
SAI4:00 pmSiem Reap–Angkor Intl
30h 45m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$777

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 July 5, 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

Tue 9/29

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 10/15

10:30 am-8:45 am

1 stop36h 15m

$621
Quickest round-trip

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 10/10

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Fri 10/16

4:00 pm-8:45 am

1 stop30h 45m

$776

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Tue 9/29

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Fri 10/16

4:00 pm-8:45 am

1 stop30h 45m

$777

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 9/26

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Sat 10/17

10:30 am-8:45 am

1 stop36h 15m

$800

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sat 10/10

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Fri 10/16

4:00 pm-8:45 am

1 stop30h 45m

$804

SeattleSiem Reap

SEA - SAI

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

$821

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Wed 11/25

8:45 am-9:50 am

1 stop34h 05m

Siem Reap–Angkor Intl

Sat 12/5

10:45 am-7:10 am

1 stop35h 25m

$835

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Tue 9/29

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Thu 10/15

10:30 am-8:57 am

2 stops36h 27m

$1,000

SeattleSiem Reap

SEA - SAI

SEASAI

Seattle/Tacoma Intl

Sun 9/27

10:15 am-9:40 am

1 stop33h 25m

Siem Reap–Angkor Intl

Wed 10/14

7:10 pm-8:45 am

2 stops51h 35m

$1,065

SeattleSiem Reap

SEA - SAI

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-11:24 am

2 stops38h 54m

$1,071

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

29h 00m

Direct flights

None
The fastest flight from Seattle to Region of Siem Reap takes 29h 00m
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

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
1,562 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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