What day of the week experiences the fewest flight delays on this route?

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Seattle to Ko Samui flights?

According to our data, Alaska Airlines have had the least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

How often are flights from Seattle to Ko Samui delayed?

Historically, on average around 15% of flights between Seattle and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 165 minutes.

What is the most punctual flight time for Seattle to Ko Samui flights?

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

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

EVA Air and Singapore Airlines are the most popular carriers 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 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.

$838 Cheap Flights from Seattle to Ko Samui in 2026

Find the cheapest flights from Seattle to Ko Samui

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:40 am - 8:00 amSEA Seattle/Tacoma Intl-USM Ko Samui

32h 20m1 stop Singapore Changi

6:05 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

52h 00m1 stop Singapore Changi

$838Singapore Airlines

Wed, Dec 2 - Wed, Dec 9

8:40 am - 8:00 amSEA Seattle/Tacoma Intl-USM Ko Samui

32h 20m1 stop Singapore Changi

6:05 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

52h 00m1 stop Singapore Changi

$886Singapore Airlines

Wed, Dec 2 - Wed, Dec 9

8:40 am - 8:00 amSEA Seattle/Tacoma Intl-USM Ko Samui

32h 20m1 stop Singapore Changi

7:45 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

50h 20m1 stop Singapore Changi

$886Singapore Airlines

Wed, Dec 2 - Wed, Dec 9

10:15 am - 5:20 pmSEA Seattle/Tacoma Intl-USM Ko Samui

41h 05m1 stop Singapore Changi

11:05 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

35h 40m1 stop Singapore Changi

$940Singapore Airlines

Thu, Oct 15 - Thu, Oct 22

10:50 am - 7:45 amSEA Seattle/Tacoma Intl-USM Ko Samui

29h 55m2 stops Hong Kong Intl Bangkok Suvarnabhumi

8:40 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

27h 05m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$945Multiple Airlines

Tue, Feb 2 - Wed, Feb 17

10:50 am - 7:10 amSEA Seattle/Tacoma Intl-USM Ko Samui

29h 20m2 stops Hong Kong Intl Bangkok Suvarnabhumi

8:40 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

39h 05m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$959Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

10:50 am - 7:45 amSEA Seattle/Tacoma Intl-USM Ko Samui

29h 55m2 stops Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$968Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

11:45 am - 8:15 amSEA Seattle/Tacoma Intl-USM Ko Samui

30h 30m2 stops Hong Kong Intl Bangkok Suvarnabhumi

8:30 pm - 9:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

27h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$974Multiple Airlines

Wed, Oct 21 - Mon, Oct 26

10:03 am - 7:55 amSEA Seattle/Tacoma Intl-USM Ko Samui

30h 52m3 stops Vancouver Intl Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$1,000Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

8:09 pm - 7:40 pmSEA Seattle/Tacoma Intl-USM Ko Samui

33h 31m2 stops Los Angeles Hong Kong Intl

4:30 pm - 9:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

31h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$1,008Multiple Airlines

Sun, Oct 18 - Sun, Oct 25

Cheap last minute flights

Enter your travel dates to find the best prices.

1:30 am - 3:45 pmSEA Seattle/Tacoma Intl-USM Ko Samui

24h 15m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

9:00 pm - 7:40 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 40m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,221EVA Air

Fri, Sep 4 - Sun, Sep 6

1:30 am - 3:10 pmSEA Seattle/Tacoma Intl-USM Ko Samui

23h 40m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

6:00 am - 7:40 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

27h 40m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,221EVA Air

Fri, Sep 4 - Tue, Sep 8

1:30 am - 3:45 pmSEA Seattle/Tacoma Intl-USM Ko Samui

24h 15m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

8:45 am - 7:40 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

24h 55m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,221EVA Air

Fri, Sep 4 - Mon, Sep 7

10:15 am - 10:10 amSEA Seattle/Tacoma Intl-USM Ko Samui

33h 55m1 stop Singapore Changi

6:15 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

28h 30m1 stop Singapore Changi

$1,288Singapore Airlines

Sat, Sep 5 - Mon, Sep 7

4:30 pm - 8:15 amSEA Seattle/Tacoma Intl-USM Ko Samui

25h 45m2 stops Tokyo Haneda Bangkok Suvarnabhumi

11:55 am - 10:20 amUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 25m1 stop Hong Kong Intl

$1,689Multiple Airlines

Sat, Sep 5 - Tue, Sep 8

4:25 pm - 10:30 amSEA Seattle/Tacoma Intl-USM Ko Samui

28h 05m2 stops Doha Hamad Intl Phuket City

8:35 pm - 1:05 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

30h 30m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

$1,707Qatar Airways

Sat, Sep 5 - Tue, Sep 8

10:15 am - 9:10 pmSEA Seattle/Tacoma Intl-USM Ko Samui

20h 55m1 stop Singapore Changi

8:45 am - 7:45 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

25h 00m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,905Multiple Airlines

Sat, Sep 5 - Mon, Sep 7

4:25 pm - 9:20 amSEA Seattle/Tacoma Intl-USM Ko Samui

26h 55m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

8:35 pm - 1:05 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

30h 30m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

$1,978Qatar Airways

Sat, Sep 5 - Mon, Sep 7

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EVA Air flights from Seattle to Ko Samui

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

EVA Air

Oct 14

SEA1:30 amSeattle/Tacoma Intl

22h 15m

2 stops

USM1:45 pmKo Samui

Oct 22

USM11:45 amKo Samui

20h 55m

2 stops

SEA6:40 pmSeattle/Tacoma Intl

$1,057

EVA Air

Jan 25

SEA12:10 amSeattle/Tacoma Intl

24h 25m

2 stops

USM3:35 pmKo Samui

Feb 8

USM10:00 amKo Samui

23h 10m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,089

EVA Air

Oct 27

SEA1:10 amSeattle/Tacoma Intl

23h 45m

2 stops

USM2:55 pmKo Samui

Nov 1

USM8:30 pmKo Samui

36h 40m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,115

Cathay Pacific flights from Seattle to Ko Samui

Our best Cathay Pacific deals on Seattle to Ko Samui flight tickets

Cathay Pacific

Oct 15

SEA2:19 pmSeattle/Tacoma Intl

41h 16m

3 stops

USM9:35 pmKo Samui

Oct 22

USM11:55 amKo Samui

23h 01m

2 stops

SEA8:56 pmSeattle/Tacoma Intl

$1,113

Cathay Pacific

Oct 15

SEA2:19 pmSeattle/Tacoma Intl

41h 16m

3 stops

USM9:35 pmKo Samui

Oct 22

USM6:00 amKo Samui

28h 56m

3 stops

SEA8:56 pmSeattle/Tacoma Intl

$1,156

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:40 am-8:00 am

1 stop32h 20m

Ko Samui

Wed 12/9

6:05 pm-7:05 am

1 stop52h 00m

$838

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:40 am-8:00 am

1 stop32h 20m

Ko Samui

Wed 12/9

6:05 pm-7:05 am

1 stop52h 00m

$886

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:40 am-8:00 am

1 stop32h 20m

Ko Samui

Wed 12/9

7:45 pm-7:05 am

1 stop50h 20m

$886

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Thu 10/15

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Thu 10/22

11:05 am-8:45 am

1 stop35h 40m

$940

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 2/2

10:50 am-7:45 am

2 stops29h 55m

Ko Samui

Wed 2/17

8:40 pm-8:45 am

2 stops27h 05m

$945

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Mon 3/1

10:50 am-7:10 am

2 stops29h 20m

Ko Samui

Tue 3/9

8:40 am-8:45 am

2 stops39h 05m

$959

Quickest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Mon 3/1

10:50 am-7:45 am

2 stops29h 55m

Ko Samui

Tue 3/9

9:30 pm-8:45 am

2 stops26h 15m

$968

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 10/21

11:45 am-8:15 am

2 stops30h 30m

Ko Samui

Mon 10/26

8:30 pm-9:45 am

2 stops27h 15m

$974

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Mon 3/1

10:03 am-7:55 am

3 stops30h 52m

Ko Samui

Tue 3/9

9:30 pm-8:45 am

2 stops26h 15m

$1,000

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sun 10/18

8:09 pm-7:40 pm

2 stops33h 31m

Ko Samui

Sun 10/25

4:30 pm-9:45 am

2 stops31h 15m

$1,008

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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

Prices

Airlines

Delays

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

You could potentially save up to 9% 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

Best Price Found	$1,271
Fastest flight time	24h 55m
Direct flights	None

The best one-way flight to Ko Samui from Seattle in the past 72 hours is $1,271. The best round-trip flight deal from Seattle to Ko Samui found on momondo in the last 72 hours is $838.

The fastest flight from Seattle to Ko Samui takes 24h 55m

There are no direct flights from Seattle to Ko Samui. There are no popular flight routes from Seattle to Ko Samui.

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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 24h 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 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.

Ko Tao

Ko Pha Ngan

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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Cheap flights from Seattle to Ko Samui from $838

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 12/2. 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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EVA Air flights from Seattle to Ko Samui

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

Cathay Pacific flights from Seattle to Ko Samui

Our best Cathay Pacific deals on Seattle to Ko Samui flight tickets

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How to get the cheapest flight ticket from Seattle to Ko Samui

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

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

How often are flights from Seattle to Ko Samui delayed?

What is the most punctual flight time for Seattle to Ko Samui flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on Seattle to Ko Samui flights?

When to book flights from Seattle to Ko Samui

Cheap Seattle to Ko Samui (SEA to USM) flight deals and tips

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Traveling to a place near Ko Samui?

Why use momondo?

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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List of cabin classes available on flights landing in Ko Samui. Availability may vary depending on flight origin and airline.

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