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 164 minutes.

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

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Saturday 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, Delta 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.

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.

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.

$610 Cheap Flights from Seattle to Ko Samui in 2026

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.

8:45 am - 5:10 pm

SEA

USM

41h 25m

1 stop

7:45 pm - 7:10 am

USM

SEA

50h 25m

1 stop

$902Singapore Airlines

Wed, Dec 2 - Wed, Dec 9

10:15 am - 7:45 am

SEA

USM

31h 30m

1 stop

11:05 am - 8:45 am

USM

SEA

35h 40m

1 stop

$937Singapore Airlines

Sun, Aug 30 - Wed, Sep 16

8:45 am - 8:00 am

SEA

USM

32h 15m

1 stop

7:45 pm - 7:10 am

USM

SEA

50h 25m

1 stop

$1,025Singapore Airlines

Fri, Nov 27 - Sun, Dec 13

1:15 am - 3:10 pm

SEA

USM

23h 55m

2 stops

9:20 am - 4:05 pm

USM

SEA

20h 45m

2 stops

$1,136Multiple Airlines

Sun, Oct 11 - Fri, Oct 30

12:10 am - 7:10 am

SEA

USM

40h 00m

2 stops

7:00 am - 1:55 pm

USM

SEA

21h 55m

2 stops

$1,145Multiple Airlines

Tue, Jan 5 - Wed, Jan 13

9:45 am - 8:00 am

SEA

USM

32h 15m

1 stop

6:05 pm - 8:10 am

USM

SEA

28h 05m

1 stop

$1,152Singapore Airlines

Sun, Oct 25 - Wed, Oct 28

12:10 am - 12:35 pm

SEA

USM

21h 25m

2 stops

9:10 pm - 9:27 am

USM

SEA

27h 17m

2 stops

$1,161Multiple Airlines

Tue, Dec 1 - Wed, Dec 9

11:45 pm - 3:35 pm

SEA

USM

24h 50m

2 stops

10:00 am - 3:05 pm

USM

SEA

20h 05m

2 stops

$1,170Multiple Airlines

Wed, Dec 2 - Wed, Dec 9

11:45 pm - 3:35 pm

SEA

USM

24h 50m

2 stops

10:00 am - 3:05 pm

USM

SEA

20h 05m

2 stops

$1,172Multiple Airlines

Fri, Nov 27 - Sun, Dec 13

11:45 pm - 3:40 pm

SEA

USM

24h 55m

2 stops

10:00 am - 3:05 pm

USM

SEA

20h 05m

2 stops

$1,174Multiple Airlines

Wed, Dec 2 - Wed, Dec 9

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

EVA Air flights from Seattle to Ko Samui

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

EVA Air

Jan 5

SEA12:10 amSeattle/Tacoma Intl

29h 15m

2 stops

USM8:25 pmKo Samui

Jan 14

USM7:00 amKo Samui

26h 10m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,191

EVA Air

Dec 1

SEA12:10 amSeattle/Tacoma Intl

25h 50m

2 stops

USM5:00 pmKo Samui

Dec 9

USM7:00 amKo Samui

26h 10m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,212

EVA Air

Aug 29

SEA2:10 amSeattle/Tacoma Intl

22h 35m

2 stops

USM2:45 pmKo Samui

Sep 16

USM10:05 amKo Samui

23h 35m

2 stops

SEA7:40 pmSeattle/Tacoma Intl

$1,216

Singapore Airlines flights from Seattle to Ko Samui

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

Singapore Airlines

Dec 2

SEA8:45 amSeattle/Tacoma Intl

41h 25m

1 stop

USM5:10 pmKo Samui

Dec 9

USM7:45 pmKo Samui

50h 25m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$902

Singapore Airlines

Aug 30

SEA10:15 amSeattle/Tacoma Intl

31h 30m

1 stop

USM7:45 amKo Samui

Sep 16

USM11:05 amKo Samui

35h 40m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$937

Singapore Airlines

Nov 27

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

Dec 13

USM7:45 pmKo Samui

50h 25m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$1,025

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

8:45 am-5:10 pm

1 stop41h 25m

Ko Samui

Wed 12/9

7:45 pm-7:10 am

1 stop50h 25m

$902

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 8/30

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Wed 9/16

11:05 am-8:45 am

1 stop35h 40m

$937

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/27

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Sun 12/13

7:45 pm-7:10 am

1 stop50h 25m

$1,025

Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/11

1:15 am-3:10 pm

2 stops23h 55m

Ko Samui

Fri 10/30

9:20 am-4:05 pm

2 stops20h 45m

$1,136

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 1/5

12:10 am-7:10 am

2 stops40h 00m

Ko Samui

Wed 1/13

7:00 am-1:55 pm

2 stops21h 55m

$1,145

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/25

9:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 10/28

6:05 pm-8:10 am

1 stop28h 05m

$1,152

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 12/1

12:10 am-12:35 pm

2 stops21h 25m

Ko Samui

Wed 12/9

9:10 pm-9:27 am

2 stops27h 17m

$1,161

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Wed 12/9

10:00 am-3:05 pm

2 stops20h 05m

$1,170

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/27

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Sun 12/13

10:00 am-3:05 pm

2 stops20h 05m

$1,172

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 12/2

11:45 pm-3:40 pm

2 stops24h 55m

Ko Samui

Wed 12/9

10:00 am-3:05 pm

2 stops20h 05m

$1,174

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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

Delays

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

You could potentially save up to 23% 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

Fastest flight time	24h 50m
Direct flights	None

The fastest flight from Seattle to Ko Samui takes 24h 50m

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

Search flight deals

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 50m.
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 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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sun 8/9

Sun 8/16

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand

Nearby airports

Cabin classes

Other Thailand destinations

Other flights from Seattle

Complete your trip

Feeling lucky

Cheap flights from Seattle to Ko Samui from $610

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 8/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Ko Samui

Cheap round-trip flights

Cheap one-way flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

EVA Air flights from Seattle to Ko Samui

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

Singapore Airlines flights from Seattle to Ko Samui

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

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Ko Samui that are best for you.

See travel insights to Ko Samui from

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

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

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

Find info about flight duration, direct flights, and airports for your flight from Seattle to Ko Samui

Fastest flight time

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.

Popular cities in Thailand

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Seattle

According to popular flight searches on momondo this year

Complete your trip to Ko Samui

Explore popular destinations other users love

According to popular flight searches on momondo this year