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?

As of November 2025, there are 2 operators available to choose from 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.

$142 Cheap Flights from Seattle to Ko Samui in 2025/26

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Find the cheapest flights from Seattle to Ko Samui

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:15 am - 7:50 amSEA-USM

31h 35m1 stop

5:40 pm - 8:45 amUSM-SEA

29h 05m1 stop

$1,004Singapore Airlines

Find Deal

Tue, Apr 21 - Mon, May 4

12:10 am - 7:45 pmSEA-USM

28h 35m2 stops

7:15 am - 1:55 pmUSM-SEA

21h 40m2 stops

$1,009Multiple Airlines

Find Deal

Sat, Jan 10 - Sat, Jan 17

1:30 am - 7:20 amSEA-USM

39h 50m2 stops

7:15 pm - 7:30 pmUSM-SEA

38h 15m2 stops

$1,033EVA Air

Find Deal

Wed, Apr 1 - Sun, Apr 12

1:30 am - 1:45 pmSEA-USM

22h 15m2 stops

7:00 am - 7:30 pmUSM-SEA

50h 30m2 stops

$1,043EVA Air

Find Deal

Sun, Apr 5 - Sun, Apr 19

8:45 am - 8:00 amSEA-USM

32h 15m1 stop

8:55 am - 7:10 amUSM-SEA

37h 15m1 stop

$1,049Singapore Airlines

Find Deal

Sun, Jan 25 - Wed, Jan 28

10:15 am - 7:50 amSEA-USM

31h 35m1 stop

12:05 pm - 8:45 amUSM-SEA

34h 40m1 stop

$1,056Singapore Airlines

Find Deal

Tue, Apr 14 - Mon, Apr 27

1:30 am - 1:45 pmSEA-USM

22h 15m2 stops

2:00 pm - 7:30 pmUSM-SEA

19h 30m2 stops

$1,058EVA Air

Find Deal

Mon, Apr 13 - Mon, Apr 27

12:10 am - 5:00 pmSEA-USM

25h 50m2 stops

9:00 am - 6:10 pmUSM-SEA

24h 10m2 stops

$1,073EVA Air

Find Deal

Sat, Jan 24 - Wed, Jan 28

1:10 am - 2:55 pmSEA-USM

23h 45m2 stops

2:00 pm - 6:50 pmUSM-SEA

18h 50m2 stops

$1,093EVA Air

Find Deal

Tue, Mar 24 - Tue, Apr 7

8:45 am - 8:00 amSEA-USM

32h 15m1 stop

8:55 am - 7:10 amUSM-SEA

37h 15m1 stop

$1,101Singapore Airlines

Find Deal

Sun, Jan 25 - Wed, Jan 28

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets

EVA Air

Apr 1

SEA1:30 amSeattle/Tacoma Intl

39h 50m

2 stops

USM7:20 amKo Samui

Apr 12

USM7:15 pmKo Samui

38h 15m

2 stops

SEA7:30 pmSeattle/Tacoma Intl

$1,033

Find similar

EVA Air

Apr 5

SEA1:30 amSeattle/Tacoma Intl

22h 15m

2 stops

USM1:45 pmKo Samui

Apr 19

USM7:00 amKo Samui

50h 30m

2 stops

SEA7:30 pmSeattle/Tacoma Intl

$1,043

Find similar

EVA Air

Apr 13

SEA1:30 amSeattle/Tacoma Intl

22h 15m

2 stops

USM1:45 pmKo Samui

Apr 27

USM2:00 pmKo Samui

19h 30m

2 stops

SEA7:30 pmSeattle/Tacoma Intl

$1,058

Find similar

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets

Singapore Airlines

Apr 21

SEA10:15 amSeattle/Tacoma Intl

31h 35m

1 stop

USM7:50 amKo Samui

May 4

USM5:40 pmKo Samui

29h 05m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$1,004

Find similar

Singapore Airlines

Jan 25

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

Jan 28

USM8:55 amKo Samui

37h 15m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$1,049

Find similar

Singapore Airlines

Apr 14

SEA10:15 amSeattle/Tacoma Intl

31h 35m

1 stop

USM7:50 amKo Samui

Apr 27

USM12:05 pmKo Samui

34h 40m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$1,056

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/21

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Mon 5/4

5:40 pm-8:45 am

1 stop29h 05m

$1,004

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 1/10

12:10 am-7:45 pm

2 stops28h 35m

Ko Samui

Sat 1/17

7:15 am-1:55 pm

2 stops21h 40m

$1,009

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 4/1

1:30 am-7:20 am

2 stops39h 50m

Ko Samui

Sun 4/12

7:15 pm-7:30 pm

2 stops38h 15m

$1,033

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/5

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Sun 4/19

7:00 am-7:30 pm

2 stops50h 30m

$1,043

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 1/25

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 1/28

8:55 am-7:10 am

1 stop37h 15m

$1,049

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/14

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Mon 4/27

12:05 pm-8:45 am

1 stop34h 40m

$1,056

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 4/13

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Mon 4/27

2:00 pm-7:30 pm

2 stops19h 30m

$1,058

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 1/24

12:10 am-5:00 pm

2 stops25h 50m

Ko Samui

Wed 1/28

9:00 am-6:10 pm

2 stops24h 10m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 3/24

1:10 am-2:55 pm

2 stops23h 45m

Ko Samui

Tue 4/7

2:00 pm-6:50 pm

2 stops18h 50m

$1,093

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 1/25

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 1/28

8:55 am-7:10 am

1 stop37h 15m

$1,101

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first

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 25m.
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?
As of November 2025, there are 2 operators available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Ko Samui is EVA Air (50% of total bookings). The next most popular airline is Singapore Airlines (50%).

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 Airlines	PriceFrom $859	Free Cancellation	Rating 8.1 1,407 reviews		Search Singapore Airlines flights
EVA Air	PriceFrom $999	Free Cancellation	Rating 8.4 1,279 reviews		Search EVA Air flights

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.