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Cheap flights from Seattle to Ko Samui from $984

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 10/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to Ko Samui (SEA-USM)

Cheap round-trip flights

Singapore Airlines Logo
10:15 am - 11:10 amSEA-USM
34h 55m1 stop
Singapore Airlines Logo
7:25 pm - 8:45 amUSM-SEA
27h 20m1 stop
$984Singapore Airlines
Find Deal
Thu, Oct 9 - Thu, Oct 16
EVA Air Logo
1:30 am - 8:30 pmSEA-USM
29h 00m2 stops
EVA Air Logo
2:00 pm - 6:50 pmUSM-SEA
18h 50m2 stops
$1,017EVA Air
Find Deal
Wed, Oct 8 - Thu, Oct 16
Logo
11:45 pm - 3:35 pmSEA-USM
24h 50m2 stops
Logo
8:30 am - 3:05 pmUSM-SEA
21h 35m2 stops
$1,037
Find Deal
Wed, Feb 11 - Fri, Feb 20
Singapore Airlines Logo
10:15 am - 11:10 amSEA-USM
34h 55m1 stop
Singapore Airlines Logo
5:40 pm - 8:45 amUSM-SEA
29h 05m1 stop
$1,049Singapore Airlines
Find Deal
Sun, Oct 19 - Wed, Oct 22
Logo
1:30 pm - 7:35 amSEA-USM
28h 05m2 stops
Logo
9:00 pm - 10:25 amUSM-SEA
27h 25m2 stops
$1,064
Find Deal
Thu, Oct 9 - Thu, Oct 16
EVA Air Logo
1:30 am - 2:45 pmSEA-USM
23h 15m2 stops
EVA Air Logo
10:05 am - 7:30 pmUSM-SEA
23h 25m2 stops
$1,073EVA Air
Find Deal
Sat, Oct 18 - Wed, Oct 22
Turkish Airlines Logo
7:10 pm - 6:30 pmSEA-USM
33h 20m2 stops
Turkish Airlines Logo
8:50 pm - 5:15 pmUSM-SEA
34h 25m2 stops
$1,291Turkish Airlines
Find Deal
Sun, Oct 19 - Wed, Oct 22
Turkish Airlines Logo
7:10 pm - 6:30 pmSEA-USM
33h 20m2 stops
Turkish Airlines Logo
8:50 pm - 5:15 pmUSM-SEA
34h 25m2 stops
$1,292Turkish Airlines
Find Deal
Sun, Oct 19 - Wed, Oct 22
Malaysia Airlines Logo
1:30 pm - 4:35 pmSEA-USM
37h 05m3 stops
Malaysia Airlines Logo
3:50 pm - 10:25 amUSM-SEA
32h 35m3 stops
$3,366Malaysia Airlines
Find Deal
Thu, Oct 9 - Thu, Oct 16
Japan Airlines Logo
12:10 pm - 8:40 amSEA-USM
29h 30m2 stops
Japan Airlines Logo
7:00 am - 6:43 pmUSM-SEA
26h 43m3 stops
$5,558Japan Airlines
Find Deal
Tue, Dec 9 - Mon, Dec 22

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Oct 9
SEA10:15 amSeattle/Tacoma Intl
34h 55m
1 stop
USM11:10 amKo Samui
Oct 16
USM7:25 pmKo Samui
27h 20m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$984
Find similar
Singapore Airlines
Oct 19
SEA10:15 amSeattle/Tacoma Intl
34h 55m
1 stop
USM11:10 amKo Samui
Oct 22
USM5:40 pmKo Samui
29h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,049
Find similar
Singapore Airlines
Feb 11
SEA3:50 pmSeattle/Tacoma Intl
35h 25m
2 stops
USM6:15 pmKo Samui
Feb 20
USM5:40 pmKo Samui
28h 30m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$1,770
Find similar

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Oct 8
SEA1:30 amSeattle/Tacoma Intl
29h 00m
2 stops
USM8:30 pmKo Samui
Oct 16
USM2:00 pmKo Samui
18h 50m
2 stops
SEA6:50 pmSeattle/Tacoma Intl
$1,017
Find similar
EVA Air
Oct 18
SEA1:30 amSeattle/Tacoma Intl
23h 15m
2 stops
USM2:45 pmKo Samui
Oct 22
USM10:05 amKo Samui
23h 25m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$1,073
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 August 27, 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

Thu 10/9

10:15 am-11:10 am

1 stop34h 55m

Ko Samui

Thu 10/16

7:25 pm-8:45 am

1 stop27h 20m

$984

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 10/8

1:30 am-8:30 pm

2 stops29h 00m

Ko Samui

Thu 10/16

2:00 pm-6:50 pm

2 stops18h 50m

$1,017

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 2/11

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Fri 2/20

8:30 am-3:05 pm

2 stops21h 35m

$1,037

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/19

10:15 am-11:10 am

1 stop34h 55m

Ko Samui

Wed 10/22

5:40 pm-8:45 am

1 stop29h 05m

$1,049

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/9

1:30 pm-7:35 am

2 stops28h 05m

Ko Samui

Thu 10/16

9:00 pm-10:25 am

2 stops27h 25m

$1,064

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 10/18

1:30 am-2:45 pm

2 stops23h 15m

Ko Samui

Wed 10/22

10:05 am-7:30 pm

2 stops23h 25m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/19

7:10 pm-6:30 pm

2 stops33h 20m

Ko Samui

Wed 10/22

8:50 pm-5:15 pm

2 stops34h 25m

$1,291

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/19

7:10 pm-6:30 pm

2 stops33h 20m

Ko Samui

Wed 10/22

8:50 pm-5:15 pm

2 stops34h 25m

$1,292

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/9

1:30 pm-4:35 pm

3 stops37h 05m

Ko Samui

Thu 10/16

3:50 pm-10:25 am

3 stops32h 35m

$3,366

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 12/9

12:10 pm-8:40 am

2 stops29h 30m

Ko Samui

Mon 12/22

7:00 am-6:43 pm

3 stops26h 43m

$5,558

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.

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 23h 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 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
1,352 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $999Free CancellationRating
8.4
1,234 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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