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Cheap flights from Washington to Ko Samui from $918

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Ko Samui departing on 3/7. 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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Find the cheapest flights from Washington to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:10 am - 9:20 pmSEA-USM
30h 10m2 stops
Multiple Airlines Logo
7:55 am - 2:55 pmUSM-SEA
21h 00m2 stops
$918Multiple Airlines
Find Deal
Sat, Mar 7 - Sun, Mar 15
Singapore Airlines Logo
10:15 am - 7:50 amSEA-USM
31h 35m1 stop
Singapore Airlines Logo
5:40 pm - 8:45 amUSM-SEA
29h 05m1 stop
$1,004Singapore Airlines
Find Deal
Tue, Apr 21 - Mon, May 4
Multiple Airlines Logo
12:10 am - 7:45 pmSEA-USM
28h 35m2 stops
Multiple Airlines Logo
7:15 am - 1:55 pmUSM-SEA
21h 40m2 stops
$1,009Multiple Airlines
Find Deal
Sat, Jan 10 - Sat, Jan 17
EVA Air Logo
1:30 am - 1:45 pmSEA-USM
22h 15m2 stops
EVA Air Logo
2:00 pm - 6:50 pmUSM-SEA
18h 50m2 stops
$1,033EVA Air
Find Deal
Tue, Apr 14 - Tue, Apr 28
EVA Air Logo
1:30 am - 1:45 pmSEA-USM
22h 15m2 stops
EVA Air Logo
7:00 am - 7:30 pmUSM-SEA
50h 30m2 stops
$1,043EVA Air
Find Deal
Sun, Apr 5 - Sun, Apr 19
Singapore Airlines Logo
10:15 am - 7:50 amSEA-USM
31h 35m1 stop
Singapore Airlines Logo
12:05 pm - 8:45 amUSM-SEA
34h 40m1 stop
$1,056Singapore Airlines
Find Deal
Tue, Apr 14 - Mon, Apr 27
EVA Air Logo
1:30 am - 1:45 pmSEA-USM
22h 15m2 stops
EVA Air Logo
2:00 pm - 7:30 pmUSM-SEA
19h 30m2 stops
$1,058EVA Air
Find Deal
Mon, Apr 13 - Mon, Apr 27
EVA Air Logo
12:10 am - 6:55 pmSEA-USM
27h 45m2 stops
EVA Air Logo
8:30 am - 5:30 pmUSM-SEA
24h 00m2 stops
$1,073EVA Air
Find Deal
Sat, Nov 29 - Thu, Dec 4
EVA Air Logo
1:10 am - 2:55 pmSEA-USM
23h 45m2 stops
EVA Air Logo
2:00 pm - 6:50 pmUSM-SEA
18h 50m2 stops
$1,093EVA Air
Find Deal
Tue, Mar 24 - Tue, Apr 7
Multiple Airlines Logo
3:15 pm - 10:35 amPDX-USM
28h 20m2 stops
Multiple Airlines Logo
8:30 pm - 2:40 pmUSM-PDX
33h 10m2 stops
$1,202Multiple Airlines
Find Deal
Thu, Jan 22 - Tue, Jan 27

Singapore Airlines flights from State of Washington to Ko Samui

Our best Singapore Airlines deals on State of Washington to Ko Samui flight tickets
Singapore Airlines
Apr 21
SEA10:15 amSeattle/Tacoma Intl
31h 35m
1 stop
USM7:50 amKo Samui
May 4
USM5:40 pmKo Samui
29h 05m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,004
Find similar
Singapore Airlines
Apr 14
SEA10:15 amSeattle/Tacoma Intl
31h 35m
1 stop
USM7:50 amKo Samui
Apr 27
USM12:05 pmKo Samui
34h 40m
1 stop
SEA8:45 amSeattle/Tacoma Intl
$1,056
Find similar
Singapore Airlines
Mar 8
SEA9:45 amSeattle/Tacoma Intl
41h 25m
1 stop
USM5:10 pmKo Samui
Mar 15
USM7:45 pmKo Samui
50h 25m
1 stop
SEA8:10 amSeattle/Tacoma Intl
$1,095
Find similar

EVA Air flights from State of Washington to Ko Samui

Our best EVA Air deals on State of Washington to Ko Samui flight tickets
EVA Air
Apr 14
SEA1:30 amSeattle/Tacoma Intl
22h 15m
2 stops
USM1:45 pmKo Samui
Apr 28
USM2:00 pmKo Samui
18h 50m
2 stops
SEA6:50 pmSeattle/Tacoma Intl
$1,033
Find similar
EVA Air
Apr 5
SEA1:30 amSeattle/Tacoma Intl
22h 15m
2 stops
USM1:45 pmKo Samui
Apr 19
USM7:00 amKo Samui
50h 30m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$1,043
Find similar
EVA Air
Apr 13
SEA1:30 amSeattle/Tacoma Intl
22h 15m
2 stops
USM1:45 pmKo Samui
Apr 27
USM2:00 pmKo Samui
19h 30m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$1,058
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 18, 2025.
Use the filters below to find and compare flights from Washington to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 3/7

12:10 am-9:20 pm

2 stops30h 10m

Ko Samui

Sun 3/15

7:55 am-2:55 pm

2 stops21h 00m

$918

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/21

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Mon 5/4

5:40 pm-8:45 am

1 stop29h 05m

$1,004

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 1/10

12:10 am-7:45 pm

2 stops28h 35m

Ko Samui

Sat 1/17

7:15 am-1:55 pm

2 stops21h 40m

$1,009

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/14

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Tue 4/28

2:00 pm-6:50 pm

2 stops18h 50m

$1,033

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/5

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Sun 4/19

7:00 am-7:30 pm

2 stops50h 30m

$1,043

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/14

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Mon 4/27

12:05 pm-8:45 am

1 stop34h 40m

$1,056

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 4/13

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Mon 4/27

2:00 pm-7:30 pm

2 stops19h 30m

$1,058

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/29

12:10 am-6:55 pm

2 stops27h 45m

Ko Samui

Thu 12/4

8:30 am-5:30 pm

2 stops24h 00m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 3/24

1:10 am-2:55 pm

2 stops23h 45m

Ko Samui

Tue 4/7

2:00 pm-6:50 pm

2 stops18h 50m

$1,093

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 1/22

3:15 pm-10:35 am

2 stops28h 20m

Ko Samui

Tue 1/27

8:30 pm-2:40 pm

2 stops33h 10m

$1,202

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Ko Samui from

How to get the cheapest flight ticket from State of Washington 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 State of Washington 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 State of Washington 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 State of Washington to Ko Samui flights?

You could potentially save up to 19% on your flight if you consider stops on a State of Washington to Ko Samui flight.

Cheap State of Washington to Ko Samui flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Ko Samui

Direct flights

None
There are no direct flights from State of Washington to Ko Samui. There are no popular flight routes from State of Washington to Ko Samui.
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  • When did momondo last update prices for flights from Washington to Ko Samui Airport?

    Prices for flights from Washington to Ko Samui Airport were last updated today.

  • How many operators does momondo search for flights from Washington to Ko Samui Airport?

  • How old do you have to be to fly from Washington to Ko Samui Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents you'll need for your trip to Ko Samui Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ko Samui Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from State of Washington to Ko Samui

Compare and see reviews for airlines that fly from State of Washington to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $859Free CancellationRating
8.1
1,406 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $999Free CancellationRating
8.4
1,277 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 Washington to Ko Samui?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington to Ko Samui. momondo saves you time and could save you money on your trip.

Can I find flights from Washington to Ko Samui with flexible booking policies on momondo?

Yes. All flights to Ko Samui from Washington on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Washington to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from Washington.

I’m not ready to book a flight from Washington to Ko Samui right now. Can momondo alert me if prices change?

Price alerts on flights to Ko Samui from Washington 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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