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 9% of their flights experiencing any sort of delay.

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

EVA Air is the most popular carrier operating from Seattle/Tacoma Intl to Ko Samui

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 146 minutes.

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 April 2026, 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.

$676 Cheap Flights from Seattle to Ko Samui in 2026

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0 bags

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.

10:15 am - 7:45 am

SEA

USM

31h 30m

1 stop

6:15 pm - 8:45 am

USM

SEA

28h 30m

1 stop

$976Singapore Airlines

Sun, Sep 6 - Fri, Sep 18

1:15 pm - 8:35 am

SEA

USM

29h 20m

2 stops

8:50 pm - 10:35 am

USM

SEA

27h 45m

2 stops

$1,020Multiple Airlines

Mon, Sep 7 - Mon, Sep 14

10:15 am - 7:45 am

SEA

USM

31h 30m

1 stop

6:05 pm - 8:10 am

USM

SEA

28h 05m

1 stop

$1,102Singapore Airlines

Thu, Oct 22 - Mon, Oct 26

10:15 am - 5:20 pm

SEA

USM

41h 05m

1 stop

6:05 pm - 8:10 am

USM

SEA

28h 05m

1 stop

$1,103Singapore Airlines

Thu, Oct 22 - Mon, Oct 26

1:30 am - 1:45 pm

SEA

USM

22h 15m

2 stops

1:50 pm - 7:20 pm

USM

SEA

19h 30m

2 stops

$1,180EVA Air

Tue, Oct 13 - Thu, Oct 22

1:15 pm - 8:35 am

SEA

USM

29h 20m

2 stops

7:50 am - 10:35 am

USM

SEA

40h 45m

2 stops

$1,205Japan Airlines

Sun, Sep 6 - Fri, Sep 18

1:30 am - 2:45 pm

SEA

USM

23h 15m

2 stops

9:00 pm - 7:00 pm

USM

SEA

36h 00m

2 stops

$1,214EVA Air

Sun, Sep 6 - Mon, Sep 14

10:15 am - 8:15 am

SEA

USM

32h 00m

2 stops

6:15 pm - 8:45 am

USM

SEA

28h 30m

1 stop

$1,254Multiple Airlines

Sun, Sep 6 - Fri, Sep 18

1:25 pm - 7:10 am

SEA

USM

27h 45m

2 stops

2:35 pm - 7:45 pm

USM

SEA

19h 10m

2 stops

$1,258Multiple Airlines

Thu, Aug 27 - Sat, Sep 5

10:15 am - 7:45 am

SEA

USM

31h 30m

1 stop

7:45 pm - 8:45 am

USM

SEA

27h 00m

1 stop

$1,271Singapore Airlines

Thu, Aug 27 - Sat, Sep 5

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Singapore Airlines flights from Seattle to Ko Samui

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

Singapore Airlines

Sep 6

SEA10:15 amSeattle/Tacoma Intl

31h 30m

1 stop

USM7:45 amKo Samui

Sep 18

USM6:15 pmKo Samui

28h 30m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$976

Singapore Airlines

Oct 22

SEA10:15 amSeattle/Tacoma Intl

31h 30m

1 stop

USM7:45 amKo Samui

Oct 26

USM6:05 pmKo Samui

28h 05m

1 stop

SEA8:10 amSeattle/Tacoma Intl

$1,102

Singapore Airlines

Oct 22

SEA10:15 amSeattle/Tacoma Intl

41h 05m

1 stop

USM5:20 pmKo Samui

Oct 26

USM6:05 pmKo Samui

28h 05m

1 stop

SEA8:10 amSeattle/Tacoma Intl

$1,103

EVA Air flights from Seattle to Ko Samui

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

EVA Air

Oct 13

SEA1:30 amSeattle/Tacoma Intl

22h 15m

2 stops

USM1:45 pmKo Samui

Oct 22

USM1:50 pmKo Samui

19h 30m

2 stops

SEA7:20 pmSeattle/Tacoma Intl

$1,180

EVA Air

Sep 6

SEA1:30 amSeattle/Tacoma Intl

23h 15m

2 stops

USM2:45 pmKo Samui

Sep 14

USM9:00 pmKo Samui

36h 00m

2 stops

SEA7:00 pmSeattle/Tacoma Intl

$1,214

EVA Air

Oct 21

SEA1:30 amSeattle/Tacoma Intl

39h 40m

2 stops

USM7:10 amKo Samui

Oct 26

USM10:00 amKo Samui

23h 10m

2 stops

SEA7:10 pmSeattle/Tacoma Intl

$1,277

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Fri 9/18

6:15 pm-8:45 am

1 stop28h 30m

$976

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 9/7

1:15 pm-8:35 am

2 stops29h 20m

Ko Samui

Mon 9/14

8:50 pm-10:35 am

2 stops27h 45m

$1,020

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/22

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Mon 10/26

6:05 pm-8:10 am

1 stop28h 05m

$1,102

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 10/22

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Mon 10/26

6:05 pm-8:10 am

1 stop28h 05m

$1,103

Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/13

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Thu 10/22

1:50 pm-7:20 pm

2 stops19h 30m

$1,180

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

1:15 pm-8:35 am

2 stops29h 20m

Ko Samui

Fri 9/18

7:50 am-10:35 am

2 stops40h 45m

$1,205

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

1:30 am-2:45 pm

2 stops23h 15m

Ko Samui

Mon 9/14

9:00 pm-7:00 pm

2 stops36h 00m

$1,214

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 9/6

10:15 am-8:15 am

2 stops32h 00m

Ko Samui

Fri 9/18

6:15 pm-8:45 am

1 stop28h 30m

$1,254

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 8/27

1:25 pm-7:10 am

2 stops27h 45m

Ko Samui

Sat 9/5

2:35 pm-7:45 pm

2 stops19h 10m

$1,258

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 8/27

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Sat 9/5

7:45 pm-8:45 am

1 stop27h 00m

$1,271

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 1% 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	29h 20m
Direct flights	None

The fastest flight from Seattle to Ko Samui takes 29h 20m

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 20m.
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 April 2026, 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 Singapore Airlines (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
Singapore Airlines	PriceFrom $859	Free Cancellation	Rating 8.2 1,502 reviews		Search Singapore Airlines 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.

An easier way to manage your Ko Samui trip

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Cheap flights from Seattle to Ko Samui from $676

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 5/7. 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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Singapore Airlines flights from Seattle to Ko Samui

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EVA Air flights from Seattle to Ko Samui

Our best EVA Air 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

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

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?

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

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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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