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Ko Samui

$701+ 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 2/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Nov 15 — Nov 221
Sat 11/15
Sat 11/22
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 October 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$881
(oojo)

One-way from

$701
(Kiwi.com)

Popular in

June

Cheapest in

November
Provider with most accurate pricing for Seattle/Tacoma Intl-Ko Samui flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Ko Samui flights.
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From Washington to Ko Samui
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One-way flight from Washington to Ko Samui
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Highest demand for flights based on searches. 21% potential increase in price ($335 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($52 potential savings vs. average RT price).
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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 October 16, 2025.

This oojo deal was found by Cheapflights users on 10/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/711:45 pmSEA - USM
2 stops29h 30mMultiple Airlines
Tue 12/99:00 amUSM - SEA
2 stops21h 05mMultiple Airlines
Deal found 10/15$881
This FlightHub deal was found by Cheapflights users on 10/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Tue 12/97:45 pmUSM - SEA
1 stop50h 25mSingapore Airlines
Deal found 10/16$977
This Justfly.com deal was found by Cheapflights users on 10/16. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/158:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Wed 11/197:45 pmUSM - SEA
1 stop26h 25mSingapore Airlines
Deal found 10/16$978
This FlightHub deal was found by Cheapflights users on 10/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:10 amSEA - USM
2 stops24h 25mEVA Air
Tue 12/99:20 amUSM - SEA
2 stops23h 10mEVA Air
Deal found 10/15$1,010
This EVA Air deal was found by Cheapflights users on 10/14. 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 11/2912:10 amSEA - USM
2 stops25h 50mEVA Air
Thu 12/41:55 pmUSM - SEA
2 stops19h 15mEVA Air
Deal found 10/14$1,073
This FlightHub deal was found by Cheapflights users on 10/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1412:10 amSEA - USM
2 stops23h 45mEVA Air
Wed 11/192:05 pmUSM - SEA
2 stops19h 05mEVA Air
Deal found 10/15$1,096
This IEagle deal was found by Cheapflights users on 10/15. 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.
Tue 10/287:31 pmPDX - USM
3 stops29h 24mMultiple Airlines
Tue 11/42:05 pmUSM - PDX
3 stops23h 35mMultiple Airlines
Deal found 10/15$1,172
This Mytrip deal was found by Cheapflights users on 10/15. 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.
Sat 11/1511:30 pmSEA - USM
2 stops24h 25mMultiple Airlines
Wed 11/197:10 pmUSM - SEA
3 stops41h 56mMultiple Airlines
Deal found 10/15$1,240
This Cathay Pacific deal was found by Cheapflights users on 10/14. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/307:56 pmSEA - USM
2 stops32h 39mCathay Pacific
Thu 12/411:40 amUSM - SEA
2 stops25h 19mCathay Pacific
Deal found 10/14$1,256
This Singapore Airlines deal was found by Cheapflights users on 10/14. 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 11/308:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Thu 12/47:45 pmUSM - SEA
1 stop26h 25mSingapore Airlines
Deal found 10/14$1,266
This Cathay Pacific deal was found by Cheapflights users on 10/15. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/305:55 pmPDX - USM
2 stops35h 40mCathay Pacific
Mon 11/311:40 amUSM - PDX
2 stops48h 10mCathay Pacific
Deal found 10/15$2,258
This Justfly.com deal was found by Cheapflights users on 10/16. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:00 pmPDX - USM
2 stops32h 15mMultiple Airlines
Fri 1/211:40 amUSM - PDX
2 stops21h 50mMultiple Airlines
Deal found 10/16$4,404

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 October 16, 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

Fri 11/7

11:45 pm-3:35 pm

2 stops24h 50m

Ko Samui

Tue 12/9

7:15 am-3:05 pm

2 stops22h 50m

$881

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 11/7

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Tue 12/9

7:45 pm-7:10 am

1 stop50h 25m

$977

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/15

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Wed 11/19

7:45 pm-7:10 am

1 stop26h 25m

$978

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 11/6

12:10 am-3:40 pm

2 stops24h 30m

Ko Samui

Tue 12/9

9:20 am-5:30 pm

2 stops23h 10m

$1,010

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/15

11:30 pm-3:35 pm

2 stops25h 05m

Ko Samui

Wed 11/19

2:05 pm-6:10 pm

2 stops19h 05m

$1,010

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/29

12:10 am-5:00 pm

2 stops25h 50m

Ko Samui

Thu 12/4

1:55 pm-6:10 pm

2 stops19h 15m

$1,073

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 10/28

7:31 pm-2:55 pm

3 stops29h 24m

Ko Samui

Tue 11/4

2:05 pm-10:40 pm

3 stops23h 35m

$1,172

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 11/15

11:30 pm-2:55 pm

2 stops24h 25m

Ko Samui

Wed 11/19

7:10 pm-10:06 pm

3 stops41h 56m

$1,240

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

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 10/30

5:41 pm-7:35 pm

2 stops35h 54m

Ko Samui

Mon 11/3

11:40 am-8:50 pm

2 stops24h 10m

$2,258

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

Showing 1-10 of 14 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 October 16, 2025.

It’s typically best to fly out from State of Washington to Ko Samui in the afternoon. Doing so could potentially save you 49% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from State of Washington to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Washington to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their State of Washington to Ko Samui flight should consider departing on Monday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 Singapore Airlines and EVA Air fly from State of Washington to Ko Samui in about 24h 30m. The time it takes to get you to your destination can typically vary by up to 7h 45m. 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 October 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$859Average$1,018FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$999Average$1,351FlexibilityNo cancel feeOn-time74%

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