Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Ko Samui from $527

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 1/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

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

Trusted and free

Trusted and free

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

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:45 pm - 3:35 pmSEA-USM
24h 50m2 stops
Multiple Airlines Logo
9:20 am - 3:05 pmUSM-SEA
20h 45m2 stops
$911Multiple Airlines
Find Deal
Thu, Nov 13 - Sun, Dec 14
Multiple Airlines Logo
12:10 am - 8:45 pmSEA-USM
29h 35m2 stops
Multiple Airlines Logo
7:00 am - 1:55 pmUSM-SEA
45h 55m2 stops
$951Multiple Airlines
Find Deal
Sat, Nov 29 - Sun, Dec 7
Multiple Airlines Logo
10:05 am - 8:30 pmSEA-USM
43h 25m2 stops
Multiple Airlines Logo
7:55 am - 8:00 amUSM-SEA
39h 05m2 stops
$962Multiple Airlines
Find Deal
Thu, Nov 20 - Mon, Dec 22
Singapore Airlines Logo
8:45 am - 11:00 amSEA-USM
35h 15m1 stop
Singapore Airlines Logo
8:55 am - 7:10 amUSM-SEA
37h 15m1 stop
$970Singapore Airlines
Find Deal
Thu, Nov 20 - Mon, Dec 22
Singapore Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Singapore Airlines Logo
8:55 am - 7:10 amUSM-SEA
37h 15m1 stop
$1,018Singapore Airlines
Find Deal
Thu, Nov 20 - Sat, Dec 20
EVA Air Logo
12:10 am - 7:50 pmSEA-USM
28h 40m2 stops
EVA Air Logo
1:35 pm - 6:10 pmUSM-SEA
19h 35m2 stops
$1,067EVA Air
Find Deal
Sat, Nov 29 - Mon, Dec 8
EVA Air Logo
12:10 am - 4:25 pmSEA-USM
25h 15m2 stops
EVA Air Logo
2:05 pm - 6:10 pmUSM-SEA
19h 05m2 stops
$1,073EVA Air
Find Deal
Sat, Nov 29 - Thu, Dec 4
Cathay Pacific Logo
7:56 pm - 7:35 pmSEA-USM
32h 39m2 stops
Cathay Pacific Logo
11:40 am - 8:35 pmUSM-SEA
23h 55m2 stops
$1,251Cathay Pacific
Find Deal
Sun, Nov 30 - Tue, Dec 9
Cathay Pacific Logo
7:56 pm - 7:35 pmSEA-USM
32h 39m2 stops
Cathay Pacific Logo
11:40 am - 9:59 pmUSM-SEA
25h 19m2 stops
$1,256Cathay Pacific
Find Deal
Sun, Nov 30 - Thu, Dec 4
China Airlines Logo
12:10 am - 9:20 pmSEA-USM
30h 10m2 stops
China Airlines Logo
7:15 am - 6:10 pmUSM-SEA
49h 55m2 stops
$1,343China Airlines
Find Deal
Mon, Dec 1 - Fri, Dec 5

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Nov 20
SEA8:45 amSeattle/Tacoma Intl
35h 15m
1 stop
USM11:00 amKo Samui
Dec 22
USM8:55 amKo Samui
37h 15m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$970
Find similar
Singapore Airlines
Nov 20
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 20
USM8:55 amKo Samui
37h 15m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$1,018
Find similar
Singapore Airlines
Nov 29
SEA8:45 amSeattle/Tacoma Intl
32h 15m
1 stop
USM8:00 amKo Samui
Dec 8
USM7:45 pmKo Samui
26h 25m
1 stop
SEA7:10 amSeattle/Tacoma Intl
$1,089
Find similar

EVA Air flights from Seattle to Ko Samui

Our best EVA Air deals on Seattle to Ko Samui flight tickets
EVA Air
Nov 29
SEA12:10 amSeattle/Tacoma Intl
28h 40m
2 stops
USM7:50 pmKo Samui
Dec 8
USM1:35 pmKo Samui
19h 35m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,067
Find similar
EVA Air
Nov 29
SEA12:10 amSeattle/Tacoma Intl
25h 15m
2 stops
USM4:25 pmKo Samui
Dec 4
USM2:05 pmKo Samui
19h 05m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,073
Find similar
EVA Air
Nov 12
SEA12:10 amSeattle/Tacoma Intl
24h 25m
2 stops
USM3:35 pmKo Samui
Dec 14
USM9:10 pmKo Samui
36h 00m
2 stops
SEA6:10 pmSeattle/Tacoma Intl
$1,097
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 5, 2025.
Use the filters below to find and compare flights from Seattle to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/13

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Sun 12/14

9:20 am-3:05 pm

2 stops20h 45m

$911

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/29

12:10 am-8:45 pm

2 stops29h 35m

Ko Samui

Sun 12/7

7:00 am-1:55 pm

2 stops45h 55m

$951

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/20

10:05 am-8:30 pm

2 stops43h 25m

Ko Samui

Mon 12/22

7:55 am-8:00 am

2 stops39h 05m

$962

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/20

8:45 am-11:00 am

1 stop35h 15m

Ko Samui

Mon 12/22

8:55 am-7:10 am

1 stop37h 15m

$970

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/20

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Sat 12/20

8:55 am-7:10 am

1 stop37h 15m

$1,018

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/29

12:10 am-7:50 pm

2 stops28h 40m

Ko Samui

Mon 12/8

1:35 pm-6:10 pm

2 stops19h 35m

$1,067

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/29

12:10 am-4:25 pm

2 stops25h 15m

Ko Samui

Thu 12/4

2:05 pm-6:10 pm

2 stops19h 05m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 11/30

7:56 pm-7:35 pm

2 stops32h 39m

Ko Samui

Tue 12/9

11:40 am-8:35 pm

2 stops23h 55m

$1,251

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 11/30

7:56 pm-7:35 pm

2 stops32h 39m

Ko Samui

Thu 12/4

11:40 am-9:59 pm

2 stops25h 19m

$1,256

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 12/1

12:10 am-9:20 pm

2 stops30h 10m

Ko Samui

Fri 12/5

7:15 am-6:10 pm

2 stops49h 55m

$1,343

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Ko Samui from

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

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

Direct flights

None
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 23h 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 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?

    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?

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 AirlinesPriceFrom $859Free CancellationRating
8.1
1,391 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $999Free CancellationRating
8.4
1,270 reviews
Search EVA Air flights

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
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
Fri 12/5
Fri 12/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand