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Cheap flights from Seattle to Ko Samui from $484

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 9/15. 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
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.
Multiple Airlines Logo
7:20 pm - 8:15 amSEA  Seattle/Tacoma Intl-USM Ko Samui
22h 55m2 stops Vancouver Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
7:10 pm - 10:05 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
28h 55m2 stops Bangkok Suvarnabhumi Vancouver Intl
$836Multiple Airlines
Sat, Sep 5 - Sun, Sep 20
Singapore Airlines Logo
10:15 am - 5:20 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 05m1 stop Singapore Changi
Singapore Airlines Logo
8:40 am - 8:45 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
38h 05m1 stop Singapore Changi
$889Singapore Airlines
Thu, Oct 1 - Mon, Oct 12
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
Multiple Airlines Logo
1:15 pm - 8:15 amSEA  Seattle/Tacoma Intl-USM Ko Samui
29h 00m2 stops Tokyo Narita Bangkok Suvarnabhumi
Multiple Airlines Logo
8:45 am - 10:35 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
39h 50m2 stops Bangkok Suvarnabhumi Tokyo Narita
$951Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Singapore Airlines Logo
9:45 am - 5:10 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 25m1 stop Singapore Changi
Singapore Airlines Logo
12:00 pm - 8:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
58h 10m1 stop Singapore Changi
$973Singapore Airlines
Sun, Oct 25 - Sun, Nov 1
Singapore Airlines Logo
10:15 am - 5:20 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
41h 05m1 stop Singapore Changi
Singapore Airlines Logo
7:45 pm - 8:45 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
27h 00m1 stop Singapore Changi
$974Singapore Airlines
Thu, Sep 24 - Thu, Oct 1
Multiple Airlines Logo
12:25 pm - 12:45 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
34h 20m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
11:55 am - 4:27 pmUSM  Ko Samui-SEA Seattle/Tacoma Intl
42h 32m2 stops Hong Kong Intl Vancouver Intl
$997Multiple Airlines
Thu, Sep 10 - Wed, Sep 16
Multiple Airlines Logo
5:50 pm - 7:40 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
35h 50m2 stops San Francisco Hong Kong Intl
Multiple Airlines Logo
11:55 am - 10:05 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
36h 10m1 stop Hong Kong Intl
$1,001Multiple Airlines
Sat, Sep 5 - Sun, Sep 20
Multiple Airlines Logo
12:10 am - 5:00 pmSEA  Seattle/Tacoma Intl-USM Ko Samui
25h 50m2 stops Incheon Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
7:00 am - 1:55 pmUSM  Ko Samui-SEA Seattle/Tacoma Intl
21h 55m2 stops Bangkok Suvarnabhumi Incheon Intl
$1,010Multiple Airlines
Sun, Nov 1 - Thu, Nov 12
Multiple Airlines Logo
9:56 am - 10:35 amSEA  Seattle/Tacoma Intl-USM Ko Samui
34h 39m3 stops Vancouver Intl Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
9:10 pm - 9:10 amUSM  Ko Samui-SEA Seattle/Tacoma Intl
27h 00m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$1,014Multiple Airlines
Sun, Oct 25 - Sun, Nov 1

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Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Oct 1
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Oct 12
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$889
Singapore Airlines
Dec 2
SEA8:45 amSeattle/Tacoma Intl
41h 25m
1 stop
USM5:10 pmKo Samui
Dec 9
USM7:45 pmKo Samui
50h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$902
Singapore Airlines
Oct 25
SEA9:45 amSeattle/Tacoma Intl
41h 25m
1 stop
USM5:10 pmKo Samui
Nov 1
USM12:00 pmKo Samui
58h 10m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$973

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Nov 3
SEA11:30 pmSeattle/Tacoma Intl
26h 30m
2 stops
USM5:00 pmKo Samui
Nov 11
USM12:15 pmKo Samui
20h 55m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,044
EVA Air
Sep 23
SEA1:30 amSeattle/Tacoma Intl
30h 05m
2 stops
USM9:35 pmKo Samui
Oct 1
USM9:15 amKo Samui
23h 25m
2 stops
SEA6:40 pmSeattle/Tacoma Intl
$1,079
EVA Air
Nov 12
SEA11:30 pmSeattle/Tacoma Intl
24h 25m
2 stops
USM2:55 pmKo Samui
Nov 18
USM2:05 pmKo Samui
19h 05m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,102

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 13, 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

Sat 9/5

7:20 pm-8:15 am

2 stops22h 55m

Ko Samui

Sun 9/20

7:10 pm-10:05 am

2 stops28h 55m

$836

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 10/1

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Mon 10/12

8:40 am-8:45 am

1 stop38h 05m

$889

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

Mon 9/7

1:15 pm-8:15 am

2 stops29h 00m

Ko Samui

Mon 9/14

8:45 am-10:35 am

2 stops39h 50m

$951

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sun 10/25

9:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Sun 11/1

12:00 pm-8:10 am

1 stop58h 10m

$973

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 9/24

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Thu 10/1

7:45 pm-8:45 am

1 stop27h 00m

$974

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 9/10

12:25 pm-12:45 pm

2 stops34h 20m

Ko Samui

Wed 9/16

11:55 am-4:27 pm

2 stops42h 32m

$997

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sat 9/5

5:50 pm-7:40 pm

2 stops35h 50m

Ko Samui

Sun 9/20

11:55 am-10:05 am

1 stop36h 10m

$1,001
Quickest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sun 11/1

12:10 am-5:00 pm

2 stops25h 50m

Ko Samui

Thu 11/12

7:00 am-1:55 pm

2 stops21h 55m

$1,010

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sun 10/25

9:56 am-10:35 am

3 stops34h 39m

Ko Samui

Sun 11/1

9:10 pm-9:10 am

2 stops27h 00m

$1,014

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

23h 45m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 23h 45m
There are no direct flights from Seattle to Ko Samui. There are no popular flight routes from Seattle to Ko Samui.
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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 23h 45m.

  • 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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