What is the cheapest airline that flies from Seattle/Tacoma Intl to Ko Samui?

Singapore Airlines is the most popular carrier operating from Seattle/Tacoma Intl to Ko Samui

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 July 2025, there is 1 operator 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

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Find the cheapest flights from Seattle to Ko Samui

Round-trip

One-way

Cheap round-trip flights

8:45 am - 8:00 amSEA-USM

32h 15m1 stop

8:55 am - 7:10 amUSM-SEA

37h 15m1 stop

$758Singapore Airlines

Find Deal

Fri, Nov 14 - Thu, Nov 20

11:00 am - 7:10 amSEA-USM

29h 10m2 stops

7:00 am - 9:00 amUSM-SEA

41h 00m2 stops

$871

Find Deal

Mon, Nov 3 - Mon, Nov 17

12:10 am - 7:10 amSEA-USM

40h 00m2 stops

7:00 am - 1:55 pmUSM-SEA

45h 55m2 stops

$874

Find Deal

Sun, Nov 2 - Mon, Nov 17

2:15 pm - 7:45 pmSEA-USM

39h 30m2 stops

7:00 am - 12:30 pmUSM-SEA

43h 30m2 stops

$887

Find Deal

Sun, Sep 7 - Fri, Sep 19

12:10 am - 2:55 pmSEA-USM

23h 45m2 stops

10:00 am - 5:40 pmUSM-SEA

22h 40m2 stops

$1,040EVA Air

Find Deal

Thu, Nov 13 - Thu, Nov 20

1:30 am - 8:50 pmSEA-USM

29h 20m2 stops

9:00 pm - 6:50 pmUSM-SEA

35h 50m2 stops

$1,078EVA Air

Find Deal

Sat, Sep 6 - Fri, Sep 19

1:30 pm - 8:15 amSEA-USM

28h 45m2 stops

9:00 pm - 10:25 amUSM-SEA

27h 25m2 stops

$1,277Japan Airlines

Find Deal

Sun, Oct 19 - Wed, Oct 22

12:30 pm - 8:15 amSEA-USM

29h 45m2 stops

8:45 am - 10:35 amUSM-SEA

39h 50m2 stops

$1,278Turkish Airlines

Find Deal

Sat, Aug 23 - Mon, Sep 8

11:37 am - 7:20 amSEA-USM

29h 43m3 stops

10:55 am - 9:36 pmUSM-SEA

24h 41m2 stops

$1,699Cathay Pacific

Find Deal

Sun, Sep 7 - Fri, Sep 19

3:43 pm - 8:30 pmSEA-USM

38h 47m3 stops

10:55 am - 11:42 pmUSM-SEA

26h 47m2 stops

$1,813Cathay Pacific

Find Deal

Sat, Aug 23 - Mon, Sep 8

Singapore Airlines flights from Seattle to Ko Samui

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

Singapore Airlines

Nov 14

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

Nov 20

USM8:55 amKo Samui

37h 15m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$758

Find similar

Singapore Airlines

Sep 7

SEA10:15 amSeattle/Tacoma Intl

42h 15m

1 stop

USM6:30 pmKo Samui

Sep 19

USM12:05 pmKo Samui

34h 40m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$902

Find similar

Singapore Airlines

Dec 6

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

May 2

USM5:40 pmKo Samui

29h 05m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$983

Find similar

EVA Air flights from Seattle to Ko Samui

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

EVA Air

Nov 13

SEA12:10 amSeattle/Tacoma Intl

23h 45m

2 stops

USM2:55 pmKo Samui

Nov 20

USM10:00 amKo Samui

22h 40m

2 stops

SEA5:40 pmSeattle/Tacoma Intl

$1,040

Find similar

EVA Air

Sep 6

SEA1:30 amSeattle/Tacoma Intl

29h 20m

2 stops

USM8:50 pmKo Samui

Sep 19

USM9:00 pmKo Samui

35h 50m

2 stops

SEA6:50 pmSeattle/Tacoma Intl

$1,078

Find similar

EVA Air

Oct 18

SEA1:30 amSeattle/Tacoma Intl

23h 40m

2 stops

USM3:10 pmKo Samui

Oct 22

USM10:05 amKo Samui

23h 25m

2 stops

SEA7:30 pmSeattle/Tacoma Intl

$1,104

Find similar

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

Prices

Airlines

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

Best Price Found	$580
Fastest flight time	20h 55m
Direct flights	None
Airports in Ko Samui	1 airport

The best one-way flight to Ko Samui from Seattle in the past 72 hours is $580. The best round-trip flight deal from Seattle to Ko Samui found on momondo in the last 72 hours is $758.

The fastest flight from Seattle to Ko Samui takes 20h 55m

There are no direct flights from Seattle to Ko Samui. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Ko Samui Airport.

There is 1 airport near Ko Samui: Ko Samui (USM)

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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 20h 55m.
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 July 2025, there is 1 operator 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 (100% of total bookings).

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
EVA Air	PriceFrom $999	Free Cancellation	Rating 8.4 1,215 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.