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Cheap flights from Seattle to Ko Samui from $600

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
0 bags

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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
1:15 am - 3:10 pm
SEA
-
USM
23h 55m
2 stops
Multiple Airlines Logo
10:05 am - 4:35 pm
USM
-
SEA
20h 30m
2 stops
$1,008Multiple Airlines
Fri, Aug 14 - Sun, Aug 23
Multiple Airlines Logo
8:41 am - 7:40 pm
SEA
-
USM
44h 59m
2 stops
Multiple Airlines Logo
9:15 am - 10:05 am
USM
-
SEA
38h 50m
2 stops
$1,260Multiple Airlines
Sat, Apr 4 - Sun, Apr 19
Cathay Pacific Logo
11:43 am - 7:40 pm
SEA
-
USM
41h 57m
2 stops
Cathay Pacific Logo
11:55 am - 10:05 am
USM
-
SEA
36h 10m
1 stop
$1,267Cathay Pacific
Sat, Apr 4 - Sun, Apr 19
Cathay Pacific Logo
7:51 pm - 7:40 pm
SEA
-
USM
33h 49m
2 stops
Cathay Pacific Logo
11:55 am - 10:05 am
USM
-
SEA
36h 10m
1 stop
$1,273Cathay Pacific
Sat, Apr 4 - Sun, Apr 19
Multiple Airlines Logo
3:52 pm - 7:40 pm
SEA
-
USM
37h 48m
2 stops
Multiple Airlines Logo
9:15 am - 10:05 am
USM
-
SEA
38h 50m
2 stops
$1,294Multiple Airlines
Sat, Apr 4 - Sun, Apr 19
Multiple Airlines Logo
7:51 pm - 7:40 pm
SEA
-
USM
33h 49m
2 stops
Multiple Airlines Logo
9:00 pm - 10:05 am
USM
-
SEA
51h 05m
2 stops
$1,319Multiple Airlines
Sat, Apr 4 - Sat, Apr 11
Multiple Airlines Logo
1:15 am - 2:45 pm
SEA
-
USM
23h 30m
2 stops
Multiple Airlines Logo
8:40 am - 6:32 pm
USM
-
SEA
47h 52m
3 stops
$1,382Multiple Airlines
Fri, Aug 14 - Sun, Aug 23
Multiple Airlines Logo
8:04 pm - 7:40 pm
SEA
-
USM
33h 36m
2 stops
Multiple Airlines Logo
11:55 am - 10:20 am
USM
-
SEA
36h 25m
1 stop
$1,409Multiple Airlines
Sat, Aug 15 - Sun, Aug 23
Multiple Airlines Logo
4:25 pm - 10:30 am
SEA
-
USM
28h 05m
2 stops
Multiple Airlines Logo
7:45 pm - 2:55 pm
USM
-
SEA
33h 10m
3 stops
$1,436Multiple Airlines
Sat, Apr 4 - Wed, Apr 15
Singapore Airlines Logo
10:15 am - 5:20 pm
SEA
-
USM
41h 05m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$1,470Singapore Airlines
Sat, Apr 4 - Wed, Apr 15

Cathay Pacific flights from Seattle to Ko Samui

Our best Cathay Pacific deals on Seattle to Ko Samui flight tickets
Cathay Pacific
Apr 4
SEA11:10 pmSeattle/Tacoma Intl
54h 30m
2 stops
USM7:40 pmKo Samui
Apr 19
USM11:55 amKo Samui
36h 10m
1 stop
SEA10:05 amSeattle/Tacoma Intl
$1,267
Cathay Pacific
Apr 4
SEA7:51 pmSeattle/Tacoma Intl
33h 49m
2 stops
USM7:40 pmKo Samui
Apr 19
USM11:55 amKo Samui
36h 10m
1 stop
SEA10:05 amSeattle/Tacoma Intl
$1,273

Singapore Airlines flights from Seattle to Ko Samui

Our best Singapore Airlines deals on Seattle to Ko Samui flight tickets
Singapore Airlines
Apr 4
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Apr 15
USM8:40 amKo Samui
38h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,470
Singapore Airlines
Apr 4
SEA10:15 amSeattle/Tacoma Intl
41h 05m
1 stop
USM5:20 pmKo Samui
Apr 19
USM7:45 pmKo Samui
51h 00m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,521

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 February 22, 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

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 8/14

1:15 am-3:10 pm

2 stops23h 55m

Ko Samui

Sun 8/23

10:05 am-4:35 pm

2 stops20h 30m

$1,008

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

8:41 am-7:40 pm

2 stops44h 59m

Ko Samui

Sun 4/19

9:15 am-10:05 am

2 stops38h 50m

$1,260

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

11:43 am-7:40 pm

2 stops41h 57m

Ko Samui

Sun 4/19

11:55 am-10:05 am

1 stop36h 10m

$1,267

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

7:51 pm-7:40 pm

2 stops33h 49m

Ko Samui

Sun 4/19

11:55 am-10:05 am

1 stop36h 10m

$1,273

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

3:52 pm-7:40 pm

2 stops37h 48m

Ko Samui

Sun 4/19

9:15 am-10:05 am

2 stops38h 50m

$1,294

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

7:51 pm-7:40 pm

2 stops33h 49m

Ko Samui

Sat 4/11

9:00 pm-10:05 am

2 stops51h 05m

$1,319

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 8/14

1:15 am-2:45 pm

2 stops23h 30m

Ko Samui

Sun 8/23

8:40 am-6:32 pm

3 stops47h 52m

$1,382

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 8/15

8:04 pm-7:40 pm

2 stops33h 36m

Ko Samui

Sun 8/23

11:55 am-10:20 am

1 stop36h 25m

$1,409

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

4:25 pm-10:30 am

2 stops28h 05m

Ko Samui

Wed 4/15

7:45 pm-2:55 pm

3 stops33h 10m

$1,436

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 4/4

10:15 am-5:20 pm

1 stop41h 05m

Ko Samui

Wed 4/15

8:40 am-8:45 am

1 stop38h 05m

$1,470

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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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 49% 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

33h 49m

Direct flights

None
The fastest flight from Seattle to Ko Samui takes 33h 49m
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 33h 49m.

  • 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
1,463 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.

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