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Ko Samui

$583+ Cheap flights from Washington to Ko Samui (USM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Washington to Ko Samui

Keep the following information in mind while searching for Washington to Ko Samui flight deals. Data was last updated August 18, 2025.

Round-trip from

$827
(KAYAK)

One-way from

$583
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,008
From Washington to Ko Samui
Search Deals
One-way flight from Washington to Ko Samui
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Highest demand for flights based on searches. 19% potential increase in price ($313 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($50 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Washington to Ko Samui

Cheapest flights from Washington to Ko Samui
Explore the most affordable flight options available from Washington to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Gurufare deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3012:30 amSEA - USM
2 stops30h 00mEVA Air
Wed 10/89:15 amUSM - SEA
2 stops24h 15mEVA Air
Deal found 8/17$1,042
This Singapore Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1910:15 amSEA - USM
1 stop42h 15mSingapore Airlines
Wed 10/225:40 pmUSM - SEA
1 stop29h 05mSingapore Airlines
Deal found 8/17$1,049
This EVA Air deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/181:30 amSEA - USM
2 stops25h 05mEVA Air
Wed 10/2211:45 amUSM - SEA
2 stops21h 45mEVA Air
Deal found 8/17$1,104
This Gurufare deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:37 pmPDX - USM
3 stops27h 08mMultiple Airlines
Tue 9/308:50 pmUSM - PDX
3 stops39h 57mMultiple Airlines
Deal found 8/16$1,212
This Japan Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/191:30 pmSEA - USM
2 stops28h 45mJapan Airlines
Wed 10/229:00 pmUSM - SEA
2 stops27h 25mJapan Airlines
Deal found 8/17$1,230
This Mytrip deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/301:15 amSEA - USM
2 stops23h 55mMultiple Airlines
Wed 10/87:25 pmUSM - SEA
1 stop27h 20mMultiple Airlines
Deal found 8/17$1,245
This SmartFares deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/14:30 pmSEA - USM
2 stops52h 00mQatar Airways
Wed 10/82:30 pmUSM - SEA
2 stops36h 15mQatar Airways
Deal found 8/17$1,326
This IEagle deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/188:37 pmPDX - USM
3 stops27h 08mMultiple Airlines
Thu 9/252:00 pmUSM - PDX
3 stops21h 25mMultiple Airlines
Deal found 8/16$1,347
This Ovago deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/13:59 pmSEA - USM
2 stops36h 16mSingapore Airlines
Wed 10/87:25 pmUSM - SEA
1 stop27h 20mSingapore Airlines
Deal found 8/17$1,355
This Ovago deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:03 amPDX - USM
3 stops30h 17mCathay Pacific
Tue 9/3010:55 amUSM - PDX
2 stops23h 35mCathay Pacific
Deal found 8/17$1,597
This Singapore Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/202:30 pmPDX - USM
2 stops61h 45mSingapore Airlines
Wed 9/244:25 pmUSM - PDX
2 stops35h 10mSingapore Airlines
Deal found 8/17$1,694
This Gotogate deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/219:30 pmSEA - USM
2 stops26h 25mMultiple Airlines
Sun 1/410:00 amUSM - SEA
2 stops23h 35mMultiple Airlines
Deal found 8/17$4,947

Cheapflights Fare Finder

 
Customize your flight search to find flights from 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, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
Use the filters below to find and compare flights from Washington to Ko Samui that are best for you.

Fly from

Washington

Fly to

Ko Samui

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 1/20

12:30 pm-7:10 am

2 stops27h 40m

Ko Samui

Tue 1/27

7:35 pm-9:55 am

2 stops29h 20m

$827

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 1/19

12:10 am-3:35 pm

2 stops24h 25m

Ko Samui

Tue 1/27

1:45 pm-5:40 pm

2 stops18h 55m

$997

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 9/30

12:30 am-8:30 pm

2 stops30h 00m

Ko Samui

Wed 10/8

9:15 am-7:30 pm

2 stops24h 15m

$1,042

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/19

10:15 am-4:45 pm

1 stop40h 30m

Ko Samui

Wed 10/22

5:40 pm-8:45 am

1 stop29h 05m

$1,049

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 10/18

12:30 am-3:10 pm

2 stops24h 40m

Ko Samui

Wed 10/22

2:00 pm-7:30 pm

2 stops19h 30m

$1,104

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 9/23

8:37 pm-1:45 pm

3 stops27h 08m

Ko Samui

Tue 9/30

8:50 pm-10:47 pm

3 stops39h 57m

$1,212

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 10/19

1:30 pm-8:15 am

2 stops28h 45m

Ko Samui

Wed 10/22

9:00 pm-10:25 am

2 stops27h 25m

$1,230

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 9/18

8:37 pm-1:45 pm

3 stops27h 08m

Ko Samui

Thu 9/25

2:00 pm-9:25 pm

3 stops21h 25m

$1,347

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 9/23

11:03 am-7:20 am

3 stops30h 17m

Ko Samui

Tue 9/30

10:55 am-8:30 pm

2 stops23h 35m

$1,597

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 12/11

5:59 pm-7:10 am

3 stops46h 11m

$583

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 11 results
1
2

Best time to book a flight from Washington to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Ko Samui

What is the cheapest time of day to fly from WA to USM?

Find hourly flight availability from Washington to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 18, 2025.

When flying from State of Washington to Ko Samui, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Washington to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ko Samui from Washington?

    Ko Samui (USM) is the airport you will fly into if you book a flight from Washington to Ko Samui. It is only a 2.1 mi journey from Ko Samui (USM) to Ko Samui’s city center.

  • How long is the flight from State of Washington to Ko Samui?

    Airlines like EVA Air and Singapore Airlines fly from State of Washington to Ko Samui in about 24h 25m. The time it takes to get you to your destination can typically vary by up to 16h 05m. The distance between State of Washington and Ko Samui is about 7715 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Washington to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Washington to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Ko Samui.

  • Can I find deals for business class flights from Washington to Ko Samui?

    Yes. Cheapflights offers flight deals from Washington to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Ko Samui

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Top 2 airlines flying from Washington to Ko Samui

Discover the top 2 airlines that operate flights from Washington to Ko Samui. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$859Average$1,051FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$999Average$1,351FlexibilityNo cancel feeOn-time74%

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