Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Ko Samui from $568

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 3/28. 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
1 adult, Economy, 0 bags

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.
Singapore Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$688Singapore Airlines
Tue, Sep 1 - Sat, Sep 5
Singapore Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$786Singapore Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
11:10 pm - 4:50 pm
SEA
-
USM
27h 40m
2 stops
Multiple Airlines Logo
8:10 am - 8:05 pm
USM
-
SEA
49h 55m
2 stops
$842Multiple Airlines
Tue, Sep 1 - Sat, Sep 5
Multiple Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Multiple Airlines Logo
6:25 pm - 8:45 am
USM
-
SEA
28h 20m
2 stops
$945Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
EVA Air Logo
2:10 am - 1:45 pm
SEA
-
USM
21h 35m
2 stops
EVA Air Logo
9:00 pm - 7:40 pm
USM
-
SEA
36h 40m
2 stops
$946EVA Air
Sun, Aug 30 - Sun, Sep 6
EVA Air Logo
2:10 am - 1:45 pm
SEA
-
USM
21h 35m
2 stops
EVA Air Logo
9:00 pm - 7:40 pm
USM
-
SEA
36h 40m
2 stops
$958EVA Air
Sun, Aug 30 - Sun, Sep 6
EVA Air Logo
1:30 am - 3:45 pm
SEA
-
USM
24h 15m
2 stops
EVA Air Logo
8:45 am - 7:30 pm
USM
-
SEA
24h 45m
2 stops
$1,004EVA Air
Sun, Apr 26 - Mon, May 4
EVA Air Logo
1:30 am - 8:50 pm
SEA
-
USM
29h 20m
2 stops
EVA Air Logo
2:00 pm - 7:30 pm
USM
-
SEA
19h 30m
2 stops
$1,025EVA Air
Tue, Apr 28 - Wed, May 6
EVA Air Logo
1:30 am - 5:05 pm
SEA
-
USM
25h 35m
2 stops
EVA Air Logo
10:05 am - 7:40 pm
USM
-
SEA
23h 35m
2 stops
$1,047EVA Air
Fri, Sep 4 - Wed, Sep 9
Multiple Airlines Logo
1:15 am - 8:50 pm
SEA
-
USM
29h 35m
2 stops
Multiple Airlines Logo
6:00 am - 4:10 pm
USM
-
SEA
48h 10m
2 stops
$1,068Multiple Airlines
Tue, Apr 21 - Wed, Apr 29

Cathay Pacific flights from Seattle to Ko Samui

Our best Cathay Pacific deals on Seattle to Ko Samui flight tickets
Cathay Pacific
Aug 31
SEA1:13 pmSeattle/Tacoma Intl
40h 27m
2 stops
USM7:40 pmKo Samui
Sep 6
USM11:55 amKo Samui
36h 25m
1 stop
SEA10:20 amSeattle/Tacoma Intl
$1,275
Cathay Pacific
Apr 22
SEA7:51 pmSeattle/Tacoma Intl
33h 49m
2 stops
USM7:40 pmKo Samui
Apr 29
USM11:55 amKo Samui
36h 10m
1 stop
SEA10:05 amSeattle/Tacoma Intl
$1,277
Cathay Pacific
Apr 4
SEA7:51 pmSeattle/Tacoma Intl
33h 49m
2 stops
USM7:40 pmKo Samui
Apr 19
USM11:55 amKo Samui
48h 47m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,303

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Sep 1
SEA10:15 amSeattle/Tacoma Intl
31h 30m
1 stop
USM7:45 amKo Samui
Sep 5
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$688
Singapore Airlines
Sep 1
SEA10:15 amSeattle/Tacoma Intl
31h 30m
1 stop
USM7:45 amKo Samui
Sep 7
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$786
Singapore Airlines
Sep 5
SEA10:15 amSeattle/Tacoma Intl
31h 30m
1 stop
USM7:45 amKo Samui
Sep 9
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,264

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 March 16, 2026.
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

Cheapest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/1

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Sat 9/5

8:40 am-8:45 am

1 stop38h 05m

$688

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/1

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Mon 9/7

8:40 am-8:45 am

1 stop38h 05m

$786

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/1

11:10 pm-4:50 pm

2 stops27h 40m

Ko Samui

Sat 9/5

8:10 am-8:05 pm

2 stops49h 55m

$842

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/1

10:15 am-7:45 am

1 stop31h 30m

Ko Samui

Mon 9/7

6:25 pm-8:45 am

2 stops28h 20m

$945

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 8/30

2:10 am-1:45 pm

2 stops21h 35m

Ko Samui

Sun 9/6

9:00 pm-7:40 pm

2 stops36h 40m

$946

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 8/30

2:10 am-1:45 pm

2 stops21h 35m

Ko Samui

Sun 9/6

9:00 pm-7:40 pm

2 stops36h 40m

$958

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/26

1:30 am-3:45 pm

2 stops24h 15m

Ko Samui

Mon 5/4

8:45 am-7:30 pm

2 stops24h 45m

$1,004
Quickest round-trip

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/28

1:30 am-8:50 pm

2 stops29h 20m

Ko Samui

Wed 5/6

2:00 pm-7:30 pm

2 stops19h 30m

$1,025

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 9/4

1:30 am-5:05 pm

2 stops25h 35m

Ko Samui

Wed 9/9

10:05 am-7:40 pm

2 stops23h 35m

$1,047

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/21

1:15 am-8:50 pm

2 stops29h 35m

Ko Samui

Wed 4/29

6:00 am-4:10 pm

2 stops48h 10m

$1,068

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 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

25h 20m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 25h 20m
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 25h 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?

  • 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
8.2
1,475 reviews
Search Singapore Airlines flights

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
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

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
Wed 4/15
Wed 4/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand