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Cheap flights from Seattle to Ko Samui from $790

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 7/2. 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
10:15 am - 5:20 pm
SEA
-
USM
41h 05m
1 stop
Singapore Airlines Logo
11:05 am - 8:45 am
USM
-
SEA
35h 40m
1 stop
$862Singapore Airlines
Fri, Oct 2 - Fri, Oct 9
Singapore Airlines Logo
8:45 am - 5:10 pm
SEA
-
USM
41h 25m
1 stop
Singapore Airlines Logo
7:45 pm - 7:10 am
USM
-
SEA
50h 25m
1 stop
$901Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
8:45 am - 5:10 pm
SEA
-
USM
41h 25m
1 stop
Singapore Airlines Logo
7:45 pm - 7:10 am
USM
-
SEA
50h 25m
1 stop
$902Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
8:45 am - 8:00 am
SEA
-
USM
32h 15m
1 stop
Singapore Airlines Logo
7:45 pm - 7:10 am
USM
-
SEA
50h 25m
1 stop
$1,025Singapore Airlines
Fri, Nov 27 - Sun, Dec 13
Singapore Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Singapore Airlines Logo
6:15 pm - 8:45 am
USM
-
SEA
28h 30m
1 stop
$1,140Singapore Airlines
Tue, Sep 1 - Fri, Sep 4
Multiple Airlines Logo
11:50 am - 7:10 am
SEA
-
USM
28h 20m
2 stops
Multiple Airlines Logo
8:40 pm - 9:17 am
USM
-
SEA
27h 37m
2 stops
$1,148Multiple Airlines
Wed, Dec 2 - Wed, Dec 9
Multiple Airlines Logo
11:45 pm - 3:40 pm
SEA
-
USM
24h 55m
2 stops
Multiple Airlines Logo
7:00 am - 3:05 pm
USM
-
SEA
23h 05m
2 stops
$1,151Multiple Airlines
Fri, Nov 27 - Sun, Dec 13
Singapore Airlines Logo
10:15 am - 6:50 pm
SEA
-
USM
42h 35m
1 stop
Singapore Airlines Logo
7:45 pm - 8:45 am
USM
-
SEA
51h 00m
1 stop
$1,152Singapore Airlines
Sun, Oct 4 - Sun, Oct 11
Multiple Airlines Logo
1:15 am - 12:45 pm
SEA
-
USM
21h 30m
2 stops
Multiple Airlines Logo
5:50 pm - 9:52 am
USM
-
SEA
30h 02m
2 stops
$1,163Multiple Airlines
Sat, Oct 3 - Sun, Oct 11
Multiple Airlines Logo
11:45 pm - 3:35 pm
SEA
-
USM
24h 50m
2 stops
Multiple Airlines Logo
7:00 am - 3:05 pm
USM
-
SEA
23h 05m
2 stops
$1,180Multiple Airlines
Fri, Nov 27 - Sun, Dec 13

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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 2
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Oct 9
USM11:05 amKo Samui
35h 40m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$862
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
$901
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

Malaysia Airlines flights from Seattle to Ko Samui

Our best Malaysia Airlines deals on Seattle to Ko Samui flight tickets
Malaysia Airlines
Sep 1
SEA4:25 pmSeattle/Tacoma Intl
34h 25m
3 stops
USM4:50 pmKo Samui
Sep 4
USM3:50 pmKo Samui
32h 45m
3 stops
SEA10:35 amSeattle/Tacoma Intl
$2,443
Malaysia Airlines
Jul 1
SEA4:25 pmSeattle/Tacoma Intl
35h 35m
3 stops
USM6:00 pmKo Samui
Jul 15
USM2:30 pmKo Samui
34h 20m
3 stops
SEA10:50 amSeattle/Tacoma Intl
$3,620
Malaysia Airlines
Jul 1
SEA4:25 pmSeattle/Tacoma Intl
35h 35m
3 stops
USM6:00 pmKo Samui
Jul 13
USM2:30 pmKo Samui
34h 20m
3 stops
SEA10:50 amSeattle/Tacoma Intl
$3,621

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 June 23, 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 - USM

SEAUSM

Seattle/Tacoma Intl

Fri 10/2

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Fri 10/9

11:05 am-8:45 am

1 stop35h 40m

$862

SeattleKo Samui

SEA - USM

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

$901

SeattleKo Samui

SEA - USM

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 - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/27

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Sun 12/13

7:45 pm-7:10 am

1 stop50h 25m

$1,025

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/1

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Fri 9/4

6:15 pm-8:45 am

1 stop28h 30m

$1,140

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

11:50 am-7:10 am

2 stops28h 20m

Ko Samui

Wed 12/9

8:40 pm-9:17 am

2 stops27h 37m

$1,148

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/27

11:45 pm-3:40 pm

2 stops24h 55m

Ko Samui

Sun 12/13

7:00 am-3:05 pm

2 stops23h 05m

$1,151

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/4

10:15 am-6:50 pm

1 stop42h 35m

Ko Samui

Sun 10/11

7:45 pm-8:45 am

1 stop51h 00m

$1,152

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 10/3

1:15 am-12:45 pm

2 stops21h 30m

Ko Samui

Sun 10/11

5:50 pm-9:52 am

2 stops30h 02m

$1,163
Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/27

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Sun 12/13

7:00 am-3:05 pm

2 stops23h 05m

$1,180

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to Ko Samui from

How to get the cheapest flight ticket from Seattle to Ko Samui

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

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

You could potentially save up to 23% 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

25h 15m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 25h 15m
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 25h 15m.

  • 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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