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.

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 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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Cheap round-trip flights

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12:10 am - 5:50 pm

SEA

USM

26h 40m2 stops

9:00 am - 5:30 pm

USM

SEA

23h 30m2 stops

$974EVA Air

Mon, Jan 19 - Sat, Jan 31

12:10 am - 7:45 am

SEA

USM

40h 35m2 stops

2:05 pm - 6:10 pm

USM

SEA

19h 05m2 stops

$1,031EVA Air

Sat, Jan 31 - Mon, Feb 16

12:10 am - 4:40 pm

SEA

USM

25h 30m2 stops

8:20 pm - 6:10 pm

USM

SEA

36h 50m2 stops

$1,038EVA Air

Sat, Feb 7 - Sun, Feb 15

12:50 am - 3:45 pm

SEA

USM

24h 55m2 stops

11:45 am - 6:50 pm

USM

SEA

21h 05m2 stops

$1,043EVA Air

Sat, May 2 - Thu, May 7

12:10 am - 8:25 pm

SEA

USM

29h 15m2 stops

8:30 am - 6:10 pm

USM

SEA

24h 40m2 stops

$1,045EVA Air

Sun, Feb 1 - Mon, Feb 16

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

Fri, Jan 23 - Sat, Jan 31

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

Tue, Jan 20 - Sat, Jan 31

1:50 am - 1:45 pm

SEA

USM

21h 55m2 stops

2:00 pm - 7:30 pm

USM

SEA

19h 30m2 stops

$1,073EVA Air

Sat, May 2 - Thu, May 7

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

Sun, Feb 1 - Mon, Feb 16

10:15 am - 7:50 am

SEA

USM

31h 35m1 stop

7:45 pm - 8:45 am

USM

SEA

27h 00m1 stop

$1,104Singapore Airlines

Sun, May 3 - Thu, May 7

EVA Air flights from Seattle to Ko Samui

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

EVA Air

Jan 19

SEA12:10 amSeattle/Tacoma Intl

26h 40m

2 stops

USM5:50 pmKo Samui

Jan 31

USM9:00 amKo Samui

23h 30m

2 stops

SEA5:30 pmSeattle/Tacoma Intl

$974

Find similar

EVA Air

Jan 31

SEA12:10 amSeattle/Tacoma Intl

40h 35m

2 stops

USM7:45 amKo Samui

Feb 16

USM2:05 pmKo Samui

19h 05m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,031

Find similar

EVA Air

Feb 7

SEA12:10 amSeattle/Tacoma Intl

25h 30m

2 stops

USM4:40 pmKo Samui

Feb 15

USM8:20 pmKo Samui

36h 50m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,038

Find similar

Singapore Airlines flights from Seattle to Ko Samui

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

Singapore Airlines

Jan 20

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

Jan 31

USM8:55 amKo Samui

37h 15m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$1,059

Find similar

Singapore Airlines

Feb 1

SEA8:45 amSeattle/Tacoma Intl

32h 15m

1 stop

USM8:00 amKo Samui

Feb 16

USM6:05 pmKo Samui

28h 05m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$1,079

Find similar

Singapore Airlines

May 3

SEA10:15 amSeattle/Tacoma Intl

31h 35m

1 stop

USM7:50 amKo Samui

May 7

USM7:45 pmKo Samui

27h 00m

1 stop

SEA8:45 amSeattle/Tacoma Intl

$1,104

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 1/19

12:10 am-5:50 pm

2 stops26h 40m

Ko Samui

Sat 1/31

9:00 am-5:30 pm

2 stops23h 30m

$974

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 1/31

12:10 am-7:45 am

2 stops40h 35m

Ko Samui

Mon 2/16

2:05 pm-6:10 pm

2 stops19h 05m

$1,031

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 2/7

12:10 am-4:40 pm

2 stops25h 30m

Ko Samui

Sun 2/15

8:20 pm-6:10 pm

2 stops36h 50m

$1,038

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 5/2

12:50 am-3:45 pm

2 stops24h 55m

Ko Samui

Thu 5/7

11:45 am-6:50 pm

2 stops21h 05m

$1,043

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 2/1

12:10 am-8:25 pm

2 stops29h 15m

Ko Samui

Mon 2/16

8:30 am-6:10 pm

2 stops24h 40m

$1,045

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 1/23

12:10 am-5:40 pm

2 stops26h 30m

Ko Samui

Sat 1/31

7:55 am-5:30 pm

2 stops24h 35m

$1,053

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 1/20

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Sat 1/31

8:55 am-7:10 am

1 stop37h 15m

$1,059

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 5/2

1:50 am-1:45 pm

2 stops21h 55m

Ko Samui

Thu 5/7

2:00 pm-7:30 pm

2 stops19h 30m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 2/1

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Mon 2/16

6:05 pm-7:10 am

1 stop28h 05m

$1,079

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 5/3

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Thu 5/7

7:45 pm-8:45 am

1 stop27h 00m

$1,104

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	31h 35m
Direct flights	None

The fastest flight from Seattle to Ko Samui takes 31h 35m

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 31h 35m.
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.

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Cheap flights from Seattle to Ko Samui from $974

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 1/19. 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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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

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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