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 155 minutes.

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 10% 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.

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

Wednesday 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.

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 December 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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11:30 pm - 5:00 pm

SEA

USM

26h 30m2 stops

7:55 am - 6:10 pm

USM

SEA

25h 15m2 stops

$918EVA Air

jue., ene. 15 - mié., ene. 28

11:30 pm - 5:00 pm

SEA

USM

26h 30m2 stops

7:55 am - 5:30 pm

USM

SEA

24h 35m2 stops

$974EVA Air

jue., ene. 15 - jue., ene. 22

8:45 am - 8:00 am

SEA

USM

32h 15m1 stop

6:05 pm - 7:10 am

USM

SEA

28h 05m1 stop

$1,018Singapore Airlines

jue., ene. 15 - jue., ene. 22

12:10 am - 5:00 pm

SEA

USM

25h 50m2 stops

7:55 am - 6:10 pm

USM

SEA

25h 15m2 stops

$1,031EVA Air

sáb., ene. 24 - dom., feb. 1

12:10 am - 5:40 pm

SEA

USM

26h 30m2 stops

7:55 am - 5:30 pm

USM

SEA

24h 35m2 stops

$1,053EVA Air

vie., ene. 23 - sáb., ene. 31

8:45 am - 8:00 am

SEA

USM

32h 15m1 stop

8:55 am - 7:10 am

USM

SEA

37h 15m1 stop

$1,058Singapore Airlines

jue., ene. 15 - mié., ene. 28

8:45 am - 8:00 am

SEA

USM

32h 15m1 stop

8:55 am - 7:10 am

USM

SEA

37h 15m1 stop

$1,059Singapore Airlines

mar., ene. 20 - sáb., ene. 31

8:45 am - 8:00 am

SEA

USM

32h 15m1 stop

6:05 pm - 7:10 am

USM

SEA

28h 05m1 stop

$1,079Singapore Airlines

dom., feb. 1 - lun., feb. 16

12:10 am - 3:40 pm

SEA

USM

24h 30m2 stops

1:55 pm - 5:30 pm

USM

SEA

18h 35m2 stops

$1,088EVA Air

sáb., feb. 14 - mar., feb. 24

8:45 am - 8:00 am

SEA

USM

32h 15m1 stop

6:05 pm - 7:10 am

USM

SEA

28h 05m1 stop

$1,164Singapore Airlines

sáb., ene. 24 - sáb., ene. 31

Cathay Pacific flights from Seattle to Ko Samui

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

Cathay Pacific

Feb 2

SEA7:55 pmSeattle/Tacoma Intl

34h 25m

3 stops

USM9:20 pmKo Samui

Feb 16

USM11:40 amKo Samui

25h 08m

2 stops

SEA9:48 pmSeattle/Tacoma Intl

$2,424

Find similar

Cathay Pacific

Feb 1

SEA5:53 pmSeattle/Tacoma Intl

31h 47m

3 stops

USM4:40 pmKo Samui

Feb 16

USM2:05 pmKo Samui

35h 39m

3 stops

SEA10:44 amSeattle/Tacoma Intl

$19,764

Find similar

EVA Air flights from Seattle to Ko Samui

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

EVA Air

Jan 15

SEA11:30 pmSeattle/Tacoma Intl

26h 30m

2 stops

USM5:00 pmKo Samui

Jan 28

USM7:55 amKo Samui

25h 15m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$918

Find similar

EVA Air

Jan 15

SEA11:30 pmSeattle/Tacoma Intl

26h 30m

2 stops

USM5:00 pmKo Samui

Jan 22

USM7:55 amKo Samui

24h 35m

2 stops

SEA5:30 pmSeattle/Tacoma Intl

$974

Find similar

EVA Air

Jan 24

SEA12:10 amSeattle/Tacoma Intl

25h 50m

2 stops

USM5:00 pmKo Samui

Feb 1

USM7:55 amKo Samui

25h 15m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,031

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 1/15

11:30 pm-5:00 pm

2 stops26h 30m

Ko Samui

mié. 1/28

7:55 am-6:10 pm

2 stops25h 15m

$918

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 1/15

11:30 pm-5:00 pm

2 stops26h 30m

Ko Samui

jue. 1/22

7:55 am-5:30 pm

2 stops24h 35m

$974

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 1/15

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

jue. 1/22

6:05 pm-7:10 am

1 stop28h 05m

$1,018

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 1/24

12:10 am-5:00 pm

2 stops25h 50m

Ko Samui

dom. 2/1

7:55 am-6:10 pm

2 stops25h 15m

$1,031

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

vie. 1/23

12:10 am-5:40 pm

2 stops26h 30m

Ko Samui

sáb. 1/31

7:55 am-5:30 pm

2 stops24h 35m

$1,053

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 1/15

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

mié. 1/28

8:55 am-7:10 am

1 stop37h 15m

$1,058

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

mar. 1/20

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

sáb. 1/31

8:55 am-7:10 am

1 stop37h 15m

$1,059

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 2/1

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

lun. 2/16

6:05 pm-7:10 am

1 stop28h 05m

$1,079

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 2/14

12:10 am-3:40 pm

2 stops24h 30m

Ko Samui

mar. 2/24

1:55 pm-5:30 pm

2 stops18h 35m

$1,088

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 1/24

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

sáb. 1/31

6:05 pm-7:10 am

1 stop28h 05m

$1,164

Flights are sorted by cheapest round-trip flights first.

Sorted 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

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

Fastest flight time	26h 30m
Direct flights	None

The fastest flight from Seattle to Ko Samui takes 26h 30m

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 26h 30m.
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 December 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 Singapore Airlines (54% of total bookings). The next most popular airline is EVA Air (46%).

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 1,412 reviews		Search Singapore Airlines flights
EVA Air	PriceFrom $999	Free Cancellation	Rating 8.4 1,296 reviews		Search EVA Air flights

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.

An easier way to manage your Ko Samui trip

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Cheap flights from Seattle to Ko Samui from $918

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 1/15. 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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Big names and deals

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Filter for what you want

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Find the cheapest flights from Seattle to Ko Samui

Cheap round-trip flights

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Cathay Pacific flights from Seattle to Ko Samui

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

EVA Air flights from Seattle to Ko Samui

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

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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

What is the cheapest day to depart on your flight to Ko Samui?

What is the cheapest time of day to depart on your flight to Ko Samui?

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.

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

Wednesday 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, Delta 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.

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

How far is Seattle/Tacoma Intl to Ko Samui by plane?

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ko Samui Airport?

How many operators does momondo search 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?

What documentation or ID do you need to fly to Ko Samui Airport?

What is the most popular airline from Seattle to Ko Samui?

Best airlines flying from Seattle to Ko Samui

Compare and see reviews for airlines that fly from Seattle to Ko Samui with momondo

Traveling to a place near Ko Samui?

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Ko Samui?

Can I find flights from Seattle to Ko Samui with flexible booking policies on momondo?

How can momondo help me find flights 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?

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