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Cheap flights from Seattle to Ko Samui from $1,055

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 2/9. 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.
Multiple Airlines Logo
12:10 am - 3:40 pmSEA-USM
24h 30m2 stops
Multiple Airlines Logo
9:20 am - 1:55 pmUSM-SEA
19h 35m2 stops
$1,055Multiple Airlines
Find Deal
lun., feb. 9 - vie., feb. 20
EVA Air Logo
12:10 am - 4:25 pmSEA-USM
25h 15m2 stops
EVA Air Logo
2:05 pm - 6:10 pmUSM-SEA
19h 05m2 stops
$1,073EVA Air
Find Deal
sáb., nov. 29 - jue., dic. 4
EVA Air Logo
11:30 pm - 3:40 pmSEA-USM
25h 10m2 stops
EVA Air Logo
7:55 am - 6:10 pmUSM-SEA
25h 15m2 stops
$1,154EVA Air
Find Deal
mar., feb. 10 - vie., feb. 20
Cathay Pacific Logo
7:56 pm - 7:35 pmSEA-USM
32h 39m2 stops
Cathay Pacific Logo
11:40 am - 9:59 pmUSM-SEA
25h 19m2 stops
$1,256Cathay Pacific
Find Deal
dom., nov. 30 - jue., dic. 4
Singapore Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Singapore Airlines Logo
7:45 pm - 7:10 amUSM-SEA
26h 25m1 stop
$1,266Singapore Airlines
Find Deal
dom., nov. 30 - jue., dic. 4
Multiple Airlines Logo
12:10 am - 6:50 pmSEA-USM
27h 40m2 stops
Multiple Airlines Logo
7:00 pm - 7:16 pmUSM-SEA
39h 16m3 stops
$1,535Multiple Airlines
Find Deal
sáb., dic. 13 - dom., dic. 21
Multiple Airlines Logo
12:10 am - 6:50 pmSEA-USM
27h 40m2 stops
Multiple Airlines Logo
7:15 am - 6:40 pmUSM-SEA
26h 25m2 stops
$1,581Multiple Airlines
Find Deal
sáb., dic. 13 - dom., dic. 21
Multiple Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Multiple Airlines Logo
5:40 pm - 7:10 amUSM-SEA
28h 30m2 stops
$1,643Multiple Airlines
Find Deal
mar., feb. 10 - vie., feb. 20
Singapore Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Singapore Airlines Logo
7:45 pm - 7:10 amUSM-SEA
26h 25m1 stop
$1,681Singapore Airlines
Find Deal
dom., nov. 30 - jue., dic. 4
Multiple Airlines Logo
11:45 pm - 3:35 pmSEA-USM
24h 50m2 stops
Multiple Airlines Logo
7:55 am - 6:10 pmUSM-SEA
25h 15m2 stops
$1,698Multiple Airlines
Find Deal
dom., dic. 14 - dom., dic. 21

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Nov 8
SEA12:10 amSeattle/Tacoma Intl
24h 25m
2 stops
USM3:35 pmKo Samui
Dec 15
USM9:20 amKo Samui
23h 50m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,010
Find similar
EVA Air
Nov 29
SEA12:10 amSeattle/Tacoma Intl
25h 15m
2 stops
USM4:25 pmKo Samui
Dec 4
USM2:05 pmKo Samui
19h 05m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,073
Find similar
EVA Air
Feb 10
SEA11:30 pmSeattle/Tacoma Intl
25h 10m
2 stops
USM3:40 pmKo Samui
Feb 20
USM7:55 amKo Samui
25h 15m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,154
Find similar

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Nov 9
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 15
USM6:05 pmKo Samui
28h 05m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$939
Find similar
Singapore Airlines
Nov 30
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 4
USM7:45 pmKo Samui
26h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$1,266
Find similar
Singapore Airlines
Nov 30
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 4
USM7:45 pmKo Samui
26h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$1,681
Find similar

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 octubre 31, 2025.
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

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

lun. 2/9

12:10 am-3:40 pm

2 stops24h 30m

Ko Samui

vie. 2/20

9:20 am-1:55 pm

2 stops19h 35m

$1,055

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 11/29

12:10 am-4:25 pm

2 stops25h 15m

Ko Samui

jue. 12/4

2:05 pm-6:10 pm

2 stops19h 05m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

mar. 2/10

11:30 pm-3:40 pm

2 stops25h 10m

Ko Samui

vie. 2/20

7:55 am-6:10 pm

2 stops25h 15m

$1,154

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 11/30

7:56 pm-7:35 pm

2 stops32h 39m

Ko Samui

jue. 12/4

11:40 am-9:59 pm

2 stops25h 19m

$1,256

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 11/30

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

jue. 12/4

7:45 pm-7:10 am

1 stop26h 25m

$1,266

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 12/13

12:10 am-6:50 pm

2 stops27h 40m

Ko Samui

dom. 12/21

7:00 pm-7:16 pm

3 stops39h 16m

$1,535

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 12/13

12:10 am-6:50 pm

2 stops27h 40m

Ko Samui

dom. 12/21

7:15 am-6:40 pm

2 stops26h 25m

$1,581

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

mar. 2/10

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

vie. 2/20

5:40 pm-7:10 am

2 stops28h 30m

$1,643

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 11/30

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

jue. 12/4

7:45 pm-7:10 am

1 stop26h 25m

$1,681

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 12/14

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

dom. 12/21

7:55 am-6:10 pm

2 stops25h 15m

$1,698

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

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Tuesday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $275. Flights from Seattle to Ko Samui on a Sunday will generally be more expensive and average around $548. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest Seattle to Ko Samui flights are usually those with departure times in the afternoon. Our users have found flights to Ko Samui in the afternoon for as low as $304. In the evening is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $454 per ticket.

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

You could potentially save up to 19% 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

Direct flights

None
There are no direct flights from Seattle to Ko Samui. There are no popular flight routes from Seattle to Ko Samui.
Search flight deals

  • 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 21h 20m.

  • 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 many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ko Samui Airport?

  • 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.

  • What is the most popular airline from Seattle to Ko Samui?

Best airlines flying from Seattle to Ko Samui

Compare and see reviews for airlines that fly from Seattle to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $859Free CancellationRating
8.1
1,388 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $999Free CancellationRating
8.4
1,268 reviews
Search EVA Air flights

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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dom. 11/30
dom. 12/7
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