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Cheap flights from Seattle to Ko Samui from $486

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 Ko Samui departing on 9/5. 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 Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
9:45 am - 5:10 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 25m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
26h 25m1 stop Singapore Changi
$765Singapore Airlines
Thu, Oct 29 - Tue, Nov 10
Singapore Airlines Logo
10:15 am - 8:00 amSEA  Seattle/Tacoma Intl-USM Ko Samui
31h 45m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 8:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
26h 25m1 stop Singapore Changi
$864Singapore Airlines
Sat, Oct 24 - Thu, Oct 29
Singapore Airlines Logo
8:45 am - 8:00 amSEA  Seattle/Tacoma Intl-USM Ko Samui
32h 15m1 stop Singapore Changi
Singapore Airlines Logo
12:00 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
34h 10m1 stop Singapore Changi
$864Singapore Airlines
Sat, Nov 21 - Fri, Nov 27
Singapore Airlines Logo
8:45 am - 8:00 amSEA  Seattle/Tacoma Intl-USM Ko Samui
32h 15m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
26h 25m1 stop Singapore Changi
$864Singapore Airlines
Fri, Nov 20 - Fri, Nov 27
Singapore Airlines Logo
8:45 am - 8:00 amSEA  Seattle/Tacoma Intl-USM Ko Samui
32h 15m1 stop Singapore Changi
Singapore Airlines Logo
6:05 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
52h 05m1 stop Singapore Changi
$901Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
8:45 am - 5:10 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 25m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
50h 25m1 stop Singapore Changi
$902Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
8:45 am - 8:00 amSEA  Seattle/Tacoma Intl-USM Ko Samui
32h 15m1 stop Singapore Changi
Singapore Airlines Logo
6:05 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
52h 05m1 stop Singapore Changi
$902Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
8:45 am - 5:10 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 25m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
50h 25m1 stop Singapore Changi
$903Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Multiple Airlines Logo
9:45 am - 7:10 amSEA  Seattle/Tacoma Intl-USM Ko Samui
31h 25m2 stops Singapore Changi Bangkok Suvarnabhumi
Multiple Airlines Logo
8:55 am - 7:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
37h 15m1 stop Singapore Changi
$1,024Multiple Airlines
Thu, Oct 29 - Tue, Nov 10
EVA Air Logo
11:50 pm - 3:35 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
25h 45m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
EVA Air Logo
2:05 pm - 5:30 pmUSM  Ko Samui-SEA Seattle/Tacoma Intl
18h 25m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,031EVA Air
Thu, Oct 29 - Tue, Nov 10

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EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Oct 29
SEA11:50 pmSeattle/Tacoma Intl
25h 45m
2 stops
USM3:35 pmKo Samui
Nov 10
USM2:05 pmKo Samui
18h 25m
2 stops
SEA5:30 pmSeattle/Tacoma Intl
$1,031
EVA Air
Sep 16
SEA1:30 amSeattle/Tacoma Intl
23h 40m
2 stops
USM3:10 pmKo Samui
Sep 24
USM11:45 amKo Samui
21h 15m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$1,045
EVA Air
Dec 1
SEA12:10 amSeattle/Tacoma Intl
24h 30m
2 stops
USM3:40 pmKo Samui
Dec 9
USM7:00 amKo Samui
26h 10m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,066

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Oct 29
SEA9:45 amSeattle/Tacoma Intl
41h 25m
1 stop
USM5:10 pmKo Samui
Nov 10
USM7:45 pmKo Samui
26h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$765
Singapore Airlines
Oct 24
SEA10:15 amSeattle/Tacoma Intl
31h 45m
1 stop
USM8:00 amKo Samui
Oct 29
USM7:45 pmKo Samui
26h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$864
Singapore Airlines
Dec 2
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 9
USM6:05 pmKo Samui
52h 05m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$901

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Ko Samui 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 7, 2026.
Use the filters below to find and compare flights from Seattle to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 10/29

9:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Tue 11/10

7:45 pm-7:10 am

1 stop26h 25m

$765

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sat 10/24

10:15 am-8:00 am

1 stop31h 45m

Ko Samui

Thu 10/29

7:45 pm-8:10 am

1 stop26h 25m

$864

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sat 11/21

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Fri 11/27

12:00 pm-7:10 am

1 stop34h 10m

$864

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Fri 11/20

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Fri 11/27

7:45 pm-7:10 am

1 stop26h 25m

$864

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 12/9

6:05 pm-7:10 am

1 stop52h 05m

$901

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Wed 12/9

7:45 pm-7:10 am

1 stop50h 25m

$902

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 12/9

6:05 pm-7:10 am

1 stop52h 05m

$902

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Wed 12/9

7:45 pm-7:10 am

1 stop50h 25m

$903

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 10/29

9:45 am-7:10 am

2 stops31h 25m

Ko Samui

Tue 11/10

8:55 am-7:10 am

1 stop37h 15m

$1,024
Quickest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 10/29

11:50 pm-3:35 pm

2 stops25h 45m

Ko Samui

Tue 11/10

2:05 pm-5:30 pm

2 stops18h 25m

$1,031

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Seattle to Ko Samui

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Can stopping save me money on Seattle to Ko Samui flights?

You could potentially save up to 9% on your flight if you consider stops on a Seattle to Ko Samui flight.

When to book flights from Seattle to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Ko Samui (SEA to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Ko Samui

Fastest flight time

31h 30m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 31h 30m
There are no direct flights from Seattle to Ko Samui. There are no popular flight routes from Seattle to Ko Samui.
Search flight deals

Frequently asked questions about flying from Seattle to Ko Samui

  • How far is Seattle/Tacoma Intl to Ko Samui by plane?

    The distance between Seattle/Tacoma Intl and Ko Samui is about 7708.5 mi. A reasonable flight in good conditions will take 31h 30m.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Ko Samui Airport are refreshed on a daily basis.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The required travel and health documents for your Ko Samui 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 Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Ko Samui?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Ko Samui. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Ko Samui with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ko Samui from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to Ko Samui?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Ko Samui.

I’m not ready to book a flight from Seattle to Ko Samui right now. Can momondo alert me if prices change?

Price alerts on flights to Ko Samui from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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