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Cheap flights from Seattle to Ko Samui from $550

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
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
6:15 pm - 8:45 am
USM
-
SEA
52h 30m
1 stop
$1,017Singapore Airlines
Tue, Sep 8 - Tue, Sep 29
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
$1,091Singapore Airlines
Tue, Sep 8 - Mon, Sep 28
Multiple Airlines Logo
1:15 pm - 8:35 am
SEA
-
USM
29h 20m
2 stops
Multiple Airlines Logo
8:35 pm - 9:52 am
USM
-
SEA
27h 17m
2 stops
$1,125Multiple Airlines
Tue, Sep 8 - Tue, Sep 29
Japan Airlines Logo
1:15 pm - 8:35 am
SEA
-
USM
29h 20m
2 stops
Japan Airlines Logo
7:50 am - 3:58 pm
USM
-
SEA
46h 08m
3 stops
$1,149Japan Airlines
Tue, Sep 8 - Tue, Sep 29
EVA Air Logo
1:30 am - 1:45 pm
SEA
-
USM
22h 15m
2 stops
EVA Air Logo
11:45 am - 7:40 pm
USM
-
SEA
21h 55m
2 stops
$1,180EVA Air
Tue, Sep 8 - Wed, Sep 30
EVA Air Logo
1:30 am - 2:45 pm
SEA
-
USM
23h 15m
2 stops
EVA Air Logo
11:45 am - 7:40 pm
USM
-
SEA
21h 55m
2 stops
$1,214EVA Air
Sun, Sep 6 - Wed, Sep 30
EVA Air Logo
1:30 am - 3:10 pm
SEA
-
USM
23h 40m
2 stops
EVA Air Logo
10:05 am - 7:20 pm
USM
-
SEA
23h 15m
2 stops
$1,218EVA Air
Sun, Sep 20 - Fri, Oct 9
EVA Air Logo
1:30 am - 1:45 pm
SEA
-
USM
22h 15m
2 stops
EVA Air Logo
11:45 am - 7:40 pm
USM
-
SEA
21h 55m
2 stops
$1,240EVA Air
Tue, Sep 8 - Mon, Sep 28
EVA Air Logo
1:30 am - 1:45 pm
SEA
-
USM
22h 15m
2 stops
EVA Air Logo
7:50 am - 7:40 pm
USM
-
SEA
25h 50m
2 stops
$1,241EVA Air
Wed, Sep 9 - Tue, Sep 29
EVA Air Logo
1:30 am - 2:45 pm
SEA
-
USM
23h 15m
2 stops
EVA Air Logo
11:45 am - 6:40 pm
USM
-
SEA
20h 55m
2 stops
$1,277EVA Air
Sun, Sep 6 - Thu, Oct 1

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Sep 8
SEA1:30 amSeattle/Tacoma Intl
22h 15m
2 stops
USM1:45 pmKo Samui
Sep 29
USM9:15 amKo Samui
23h 45m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$1,180
EVA Air
Sep 6
SEA1:30 amSeattle/Tacoma Intl
23h 15m
2 stops
USM2:45 pmKo Samui
Sep 30
USM11:45 amKo Samui
21h 55m
2 stops
SEA7:40 pmSeattle/Tacoma Intl
$1,214
EVA Air
Sep 20
SEA1:30 amSeattle/Tacoma Intl
23h 40m
2 stops
USM3:10 pmKo Samui
Oct 9
USM10:05 amKo Samui
23h 15m
2 stops
SEA7:20 pmSeattle/Tacoma Intl
$1,218

Cathay Pacific flights from Seattle to Ko Samui

Our best Cathay Pacific deals on Seattle to Ko Samui flight tickets
Cathay Pacific
Jun 20
SEA5:36 pmSeattle/Tacoma Intl
36h 04m
2 stops
USM7:40 pmKo Samui
Jun 27
USM11:55 amKo Samui
34h 52m
2 stops
SEA8:47 amSeattle/Tacoma Intl
$1,763
Cathay Pacific
Jun 20
SEA5:36 pmSeattle/Tacoma Intl
36h 04m
2 stops
USM7:40 pmKo Samui
Jun 27
USM11:55 amKo Samui
33h 12m
2 stops
SEA7:07 amSeattle/Tacoma Intl
$1,770
Cathay Pacific
Oct 7
SEA11:45 amSeattle/Tacoma Intl
29h 25m
2 stops
USM7:10 amKo Samui
Oct 11
USM11:55 amKo Samui
36h 10m
1 stop
SEA10:05 amSeattle/Tacoma Intl
$1,933

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 29, 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 9/8

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Tue 9/29

6:15 pm-8:45 am

1 stop52h 30m

$1,017

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/8

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Mon 9/28

8:40 am-8:45 am

1 stop38h 05m

$1,091

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/8

1:15 pm-8:35 am

2 stops29h 20m

Ko Samui

Tue 9/29

8:35 pm-9:52 am

2 stops27h 17m

$1,125

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/8

1:15 pm-8:35 am

2 stops29h 20m

Ko Samui

Tue 9/29

7:50 am-3:58 pm

3 stops46h 08m

$1,149
Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/8

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Wed 9/30

11:45 am-7:40 pm

2 stops21h 55m

$1,180

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

1:30 am-2:45 pm

2 stops23h 15m

Ko Samui

Wed 9/30

11:45 am-7:40 pm

2 stops21h 55m

$1,214

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/20

1:30 am-3:10 pm

2 stops23h 40m

Ko Samui

Fri 10/9

10:05 am-7:20 pm

2 stops23h 15m

$1,218

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/8

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Mon 9/28

11:45 am-7:40 pm

2 stops21h 55m

$1,240

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 9/9

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Tue 9/29

7:50 am-7:40 pm

2 stops25h 50m

$1,241

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

1:30 am-2:45 pm

2 stops23h 15m

Ko Samui

Thu 10/1

11:45 am-6:40 pm

2 stops20h 55m

$1,277

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

22h 15m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 22h 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 22h 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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