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 167 minutes.

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 10% of their flights experiencing any sort of delay.

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

Friday 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.

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

Cathay Pacific is the most popular carrier operating from Seattle/Tacoma Intl to Ko Samui

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

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

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.

$509 Cheap Flights from Seattle to Ko Samui in 2026/27

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

35h 15m1 stop Singapore Changi

12:00 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

34h 05m1 stop Singapore Changi

$790Singapore Airlines

Tue, Nov 3 - Thu, Nov 19

8:40 am - 10:55 amSEA Seattle/Tacoma Intl-USM Ko Samui

35h 15m1 stop Singapore Changi

12:00 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

34h 05m1 stop Singapore Changi

$791Singapore Airlines

Tue, Nov 3 - Tue, Nov 17

10:25 am - 7:35 amSEA Seattle/Tacoma Intl-USM Ko Samui

30h 10m2 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

$941Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

12:00 pm - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

40h 35m2 stops Los Angeles Hong Kong Intl

11:40 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

$959Multiple Airlines

Tue, Nov 3 - Tue, Nov 17

3:59 pm - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

36h 36m2 stops Los Angeles Hong Kong Intl

11:40 am - 10:43 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 03m2 stops Hong Kong Intl Los Angeles

$969Multiple Airlines

Tue, Nov 3 - Thu, Nov 19

4:20 pm - 7:40 pmSEA Seattle/Tacoma Intl-USM Ko Samui

37h 20m2 stops Los Angeles Hong Kong Intl

11:55 am - 12:40 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

38h 45m2 stops Hong Kong Intl Los Angeles

$988Multiple Airlines

Sun, Apr 18 - Sat, Apr 24

12:00 pm - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

40h 35m2 stops Los Angeles Hong Kong Intl

11:40 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

$994Cathay Pacific

Tue, Nov 3 - Wed, Nov 18

10:03 am - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

42h 32m2 stops Vancouver Intl Hong Kong Intl

11:40 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

$998Cathay Pacific

Wed, Nov 18 - Wed, Nov 25

6:00 am - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

46h 35m2 stops Los Angeles Hong Kong Intl

11:40 am - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

$1,007Cathay Pacific

Tue, Nov 3 - Tue, Nov 17

10:03 am - 7:35 pmSEA Seattle/Tacoma Intl-USM Ko Samui

42h 32m2 stops Vancouver Intl Hong Kong Intl

11:40 am - 8:56 pmUSM Ko Samui-SEA Seattle/Tacoma Intl

24h 16m2 stops Hong Kong Intl Los Angeles

$1,008Multiple Airlines

Wed, Nov 18 - Wed, Nov 25

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Cathay Pacific flights from Seattle to Ko Samui

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

Cathay Pacific

Nov 3

SEA12:00 pmSeattle/Tacoma Intl

40h 35m

2 stops

USM7:35 pmKo Samui

Nov 16

USM11:40 amKo Samui

36h 05m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$994

Cathay Pacific

Nov 18

SEA10:03 amSeattle/Tacoma Intl

42h 32m

2 stops

USM7:35 pmKo Samui

Nov 25

USM11:40 amKo Samui

36h 05m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$998

Cathay Pacific

Nov 3

SEA6:00 amSeattle/Tacoma Intl

46h 35m

2 stops

USM7:35 pmKo Samui

Nov 17

USM11:40 amKo Samui

36h 05m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$1,007

Singapore Airlines flights from Seattle to Ko Samui

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

Singapore Airlines

Nov 3

SEA8:40 amSeattle/Tacoma Intl

35h 15m

1 stop

USM10:55 amKo Samui

Nov 19

USM12:00 pmKo Samui

34h 05m

1 stop

SEA7:05 amSeattle/Tacoma Intl

$790

Singapore Airlines

Nov 3

SEA8:40 amSeattle/Tacoma Intl

35h 15m

1 stop

USM10:55 amKo Samui

Nov 17

USM12:00 pmKo Samui

34h 05m

1 stop

SEA7:05 amSeattle/Tacoma Intl

$791

Singapore Airlines

Nov 3

SEA8:40 amSeattle/Tacoma Intl

41h 30m

1 stop

USM5:10 pmKo Samui

Nov 16

USM6:05 pmKo Samui

28h 00m

1 stop

SEA7:05 amSeattle/Tacoma Intl

$1,019

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

8:40 am-10:55 am

1 stop35h 15m

Ko Samui

Thu 11/19

12:00 pm-7:05 am

1 stop34h 05m

$790

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

8:40 am-10:55 am

1 stop35h 15m

Ko Samui

Tue 11/17

12:00 pm-7:05 am

1 stop34h 05m

$791

Quickest round-trip

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Mon 3/1

10:25 am-7:35 am

2 stops30h 10m

Ko Samui

Tue 3/9

9:30 pm-8:45 am

2 stops26h 15m

$941

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

12:00 pm-7:35 pm

2 stops40h 35m

Ko Samui

Tue 11/17

11:40 am-8:45 am

1 stop36h 05m

$959

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

3:59 pm-7:35 pm

2 stops36h 36m

Ko Samui

Thu 11/19

11:40 am-10:43 pm

2 stops26h 03m

$969

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Sun 4/18

4:20 pm-7:40 pm

2 stops37h 20m

Ko Samui

Sat 4/24

11:55 am-12:40 pm

2 stops38h 45m

$988

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

12:00 pm-7:35 pm

2 stops40h 35m

Ko Samui

Wed 11/18

11:40 am-8:45 am

1 stop36h 05m

$994

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 11/18

10:03 am-7:35 pm

2 stops42h 32m

Ko Samui

Wed 11/25

11:40 am-8:45 am

1 stop36h 05m

$998

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Tue 11/3

6:00 am-7:35 pm

2 stops46h 35m

Ko Samui

Tue 11/17

11:40 am-8:45 am

1 stop36h 05m

$1,007

SeattleKo Samui

SEA Seattle/Tacoma Intl - USM Ko Samui

SEAUSM

Seattle/Tacoma Intl

Wed 11/18

10:03 am-7:35 pm

2 stops42h 32m

Ko Samui

Wed 11/25

11:40 am-8:56 pm

2 stops24h 16m

$1,008

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 39% 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	$509
Fastest flight time	29h 45m
Direct flights	None

The best one-way flight to Ko Samui from Seattle in the past 72 hours is $509. The best round-trip flight deal from Seattle to Ko Samui found on momondo in the last 72 hours is $790.

The fastest flight from Seattle to Ko Samui takes 29h 45m

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 29h 45m.
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 $509

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ko Samui departing on 11/12. 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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Cathay Pacific flights from Seattle to Ko Samui

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

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Our best Singapore Airlines 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

Best Price Found

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Direct flights

Frequently asked questions about flying from Seattle to Ko Samui

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Airports servicing Thailand

Cabin classes currently available on flights to Ko Samui

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

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