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Cheap flights from Seattle to Ko Samui from $826

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ko Samui departing on 12/8. 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
8:45 am - 5:10 pm
SEA
-
USM
41h 25m
1 stop
Singapore Airlines Logo
8:55 am - 7:10 am
USM
-
SEA
37h 15m
1 stop
$826Singapore Airlines
Tue, Dec 8 - Sat, Dec 12
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
$915Singapore Airlines
Wed, Dec 2 - Wed, Dec 9
Singapore Airlines Logo
10:15 am - 6:50 pm
SEA
-
USM
42h 35m
1 stop
Singapore Airlines Logo
11:05 am - 8:45 am
USM
-
SEA
35h 40m
1 stop
$1,029Singapore Airlines
Sun, Oct 4 - Fri, Oct 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
$1,043Singapore Airlines
Fri, Nov 27 - Sun, Dec 13
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
$1,048Singapore Airlines
Fri, Nov 27 - Sun, Dec 13
EVA Air Logo
12:10 am - 3:40 pm
SEA
-
USM
24h 30m
2 stops
EVA Air Logo
7:00 am - 6:10 pm
USM
-
SEA
26h 10m
2 stops
$1,062EVA Air
Tue, Dec 1 - Wed, Dec 9
EVA Air Logo
1:30 am - 3:10 pm
SEA
-
USM
23h 40m
2 stops
EVA Air Logo
9:15 am - 7:40 pm
USM
-
SEA
24h 25m
2 stops
$1,099EVA Air
Wed, Sep 16 - Mon, Sep 21
EVA Air Logo
12:10 am - 3:40 pm
SEA
-
USM
24h 30m
2 stops
EVA Air Logo
7:00 am - 6:10 pm
USM
-
SEA
26h 10m
2 stops
$1,103EVA Air
Thu, Nov 26 - Sun, Dec 13
Multiple Airlines Logo
3:40 pm - 8:25 pm
SEA
-
USM
37h 45m
2 stops
Multiple Airlines Logo
7:00 am - 1:20 pm
USM
-
SEA
45h 20m
2 stops
$1,146Multiple Airlines
Tue, Dec 8 - Sat, Dec 12

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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
Dec 8
SEA8:45 amSeattle/Tacoma Intl
41h 25m
1 stop
USM5:10 pmKo Samui
Dec 12
USM8:55 amKo Samui
37h 15m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$826
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
$915

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
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
$1,062
EVA Air
Sep 16
SEA1:30 amSeattle/Tacoma Intl
23h 40m
2 stops
USM3:10 pmKo Samui
Sep 21
USM9:15 amKo Samui
24h 25m
2 stops
SEA7:40 pmSeattle/Tacoma Intl
$1,099
EVA Air
Nov 26
SEA12:10 amSeattle/Tacoma Intl
24h 30m
2 stops
USM3:40 pmKo Samui
Dec 13
USM7:00 amKo Samui
26h 10m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,103

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 July 28, 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

Tue 12/8

8:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Sat 12/12

8:55 am-7:10 am

1 stop37h 15m

$826

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

$915

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/4

10:15 am-6:50 pm

1 stop42h 35m

Ko Samui

Fri 10/9

11:05 am-8:45 am

1 stop35h 40m

$1,029

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

$1,043

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

$1,048

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 12/1

12:10 am-3:40 pm

2 stops24h 30m

Ko Samui

Wed 12/9

7:00 am-6:10 pm

2 stops26h 10m

$1,062
Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 9/16

1:30 am-3:10 pm

2 stops23h 40m

Ko Samui

Mon 9/21

9:15 am-7:40 pm

2 stops24h 25m

$1,099

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/26

12:10 am-3:40 pm

2 stops24h 30m

Ko Samui

Sun 12/13

7:00 am-6:10 pm

2 stops26h 10m

$1,103

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 12/8

3:40 pm-8:25 pm

2 stops37h 45m

Ko Samui

Sat 12/12

7:00 am-1:20 pm

2 stops45h 20m

$1,146

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 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

24h 55m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 24h 55m
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 24h 55m.

  • 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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