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Cheap flights from Seattle to Ko Samui from $922

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 10/15. 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
0 bags

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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
7:45 pm - 8:45 am
USM
-
SEA
51h 00m
1 stop
$922Singapore Airlines
Thu, Oct 15 - Sun, Oct 18
Multiple Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Multiple Airlines Logo
9:00 pm - 8:45 am
USM
-
SEA
49h 45m
2 stops
$1,026Multiple Airlines
Thu, Oct 15 - Sun, Oct 18
Multiple Airlines Logo
10:15 am - 8:15 am
SEA
-
USM
32h 00m
2 stops
Multiple Airlines Logo
9:00 pm - 8:45 am
USM
-
SEA
49h 45m
2 stops
$1,070Multiple Airlines
Thu, Oct 15 - Sun, Oct 18
EVA Air Logo
1:10 am - 2:55 pm
SEA
-
USM
23h 45m
2 stops
EVA Air Logo
10:00 am - 5:30 pm
USM
-
SEA
22h 30m
2 stops
$1,170EVA Air
Tue, Oct 27 - Tue, Nov 10
EVA Air Logo
1:10 am - 3:40 pm
SEA
-
USM
24h 30m
2 stops
EVA Air Logo
10:00 am - 5:30 pm
USM
-
SEA
22h 30m
2 stops
$1,180EVA Air
Tue, Oct 27 - Tue, Nov 10
EVA Air Logo
11:30 pm - 5:00 pm
SEA
-
USM
26h 30m
2 stops
EVA Air Logo
2:05 pm - 6:10 pm
USM
-
SEA
19h 05m
2 stops
$1,241EVA Air
Thu, Nov 5 - Mon, Nov 9
Multiple Airlines Logo
12:10 am - 8:15 pm
SEA
-
USM
30h 05m
3 stops
Multiple Airlines Logo
5:40 pm - 9:17 am
USM
-
SEA
30h 37m
2 stops
$1,278Multiple Airlines
Tue, Oct 27 - Tue, Nov 10
Multiple Airlines Logo
8:28 pm - 1:05 pm
SEA
-
USM
50h 37m
2 stops
Multiple Airlines Logo
7:45 pm - 7:10 am
USM
-
SEA
26h 25m
1 stop
$1,389Multiple Airlines
Wed, Oct 28 - Tue, Nov 10
Multiple Airlines Logo
7:12 am - 1:05 pm
SEA
-
USM
39h 53m
3 stops
Multiple Airlines Logo
9:10 pm - 9:17 am
USM
-
SEA
27h 07m
2 stops
$1,449Multiple Airlines
Wed, Oct 28 - Tue, Nov 10
Singapore Airlines Logo
10:15 am - 5:20 pm
SEA
-
USM
41h 05m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$1,512Singapore Airlines
Tue, Jul 21 - Mon, Aug 3

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Oct 15
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Oct 18
USM7:45 pmKo Samui
51h 00m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$922
Singapore Airlines
Jul 21
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Aug 3
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,512
Singapore Airlines
Jul 3
SEA10:15 amSeattle/Tacoma Intl
31h 30m
1 stop
USM7:45 amKo Samui
Jul 8
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,624

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Oct 27
SEA1:10 amSeattle/Tacoma Intl
23h 45m
2 stops
USM2:55 pmKo Samui
Nov 10
USM10:00 amKo Samui
22h 30m
2 stops
SEA5:30 pmSeattle/Tacoma Intl
$1,170
EVA Air
Oct 27
SEA1:10 amSeattle/Tacoma Intl
24h 30m
2 stops
USM3:40 pmKo Samui
Nov 10
USM10:00 amKo Samui
22h 30m
2 stops
SEA5:30 pmSeattle/Tacoma Intl
$1,180
EVA Air
Nov 5
SEA11:30 pmSeattle/Tacoma Intl
26h 30m
2 stops
USM5:00 pmKo Samui
Nov 9
USM2:05 pmKo Samui
19h 05m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,241

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 May 20, 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

Thu 10/15

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Sun 10/18

7:45 pm-8:45 am

1 stop51h 00m

$922

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/15

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Sun 10/18

9:00 pm-8:45 am

2 stops49h 45m

$1,026

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/15

10:15 am-8:15 am

2 stops32h 00m

Ko Samui

Sun 10/18

9:00 pm-8:45 am

2 stops49h 45m

$1,070

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/27

1:10 am-2:55 pm

2 stops23h 45m

Ko Samui

Tue 11/10

10:00 am-5:30 pm

2 stops22h 30m

$1,170

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/27

1:10 am-3:40 pm

2 stops24h 30m

Ko Samui

Tue 11/10

10:00 am-5:30 pm

2 stops22h 30m

$1,180
Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/5

11:30 pm-5:00 pm

2 stops26h 30m

Ko Samui

Mon 11/9

2:05 pm-6:10 pm

2 stops19h 05m

$1,241

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/27

12:10 am-8:15 pm

3 stops30h 05m

Ko Samui

Tue 11/10

5:40 pm-9:17 am

2 stops30h 37m

$1,278

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 10/28

8:28 pm-1:05 pm

2 stops50h 37m

Ko Samui

Tue 11/10

7:45 pm-7:10 am

1 stop26h 25m

$1,389

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 10/28

7:12 am-1:05 pm

3 stops39h 53m

Ko Samui

Tue 11/10

9:10 pm-9:17 am

2 stops27h 07m

$1,449

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 7/21

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Mon 8/3

8:40 am-8:45 am

1 stop38h 05m

$1,512

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 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

23h 05m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 23h 05m
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 23h 05m.

  • 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.

An easier way to manage your Ko Samui trip

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