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Ko Samui

$506+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Jan 31 — Feb 71
Sat 1/31
Sat 2/7
1 adult, Economy
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Cheap flight deals from Washington to Ko Samui

Best flights from Washington to Ko Samui
Discover carefully curated flight deals from Washington to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 1, 2026.

This FlightHub deal was found by Cheapflights users on 12/30. 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.
Sun 2/158:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Tue 2/247:45 pmUSM - SEA
1 stop50h 25mSingapore Airlines
Deal found 12/30$1,099
This FlightHub deal was found by Cheapflights users on 12/31. 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.
Sat 2/1412:10 amSEA - USM
2 stops26h 30mEVA Air
Tue 2/247:10 pmUSM - SEA
2 stops38h 00mEVA Air
Deal found 12/31$1,126
This Gotogate deal was found by Cheapflights users on 12/30. 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.
Thu 4/23:15 pmPDX - USM
2 stops37h 00mMultiple Airlines
Thu 4/236:55 pmUSM - PDX
2 stops28h 20mMultiple Airlines
Deal found 12/30$1,189
This FlightHub deal was found by Cheapflights users on 12/30. 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 3/271:10 amSEA - USM
2 stops23h 35mEVA Air
Sun 4/58:50 pmUSM - SEA
2 stops36h 40mEVA Air
Deal found 12/30$1,187
This CheapOair deal was found by Cheapflights users on 12/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/19:50 amPDX - USM
2 stops35h 25mMultiple Airlines
Sat 2/147:45 pmUSM - PDX
2 stops37h 45mMultiple Airlines
Deal found 12/30$1,204
This Justfly.com deal was found by Cheapflights users on 12/29. 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 2/218:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Thu 3/58:55 amUSM - SEA
1 stop37h 15mSingapore Airlines
Deal found 12/29$1,210
This CheapOair deal was found by Cheapflights users on 12/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/227:00 pmPDX - USM
2 stops27h 05mMultiple Airlines
Tue 1/277:30 pmUSM - PDX
2 stops34h 10mMultiple Airlines
Deal found 12/31$1,207
This Kiwi.com deal was found by Cheapflights users on 12/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:45 amSEA - USM
1 stop32h 15mMultiple Airlines
Thu 3/58:30 amUSM - SEA
2 stops21h 35mMultiple Airlines
Deal found 12/29$1,262
This Trip.com deal was found by Cheapflights users on 12/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1212:10 amSEA - USM
2 stops25h 50mMultiple Airlines
Fri 2/207:00 pmUSM - SEA
2 stops38h 10mMultiple Airlines
Deal found 12/30$1,302
This Trip.com deal was found by Cheapflights users on 12/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/1411:30 pmSEA - USM
2 stops25h 30mMultiple Airlines
Sat 2/2111:40 amUSM - SEA
2 stops21h 30mMultiple Airlines
Deal found 12/31$1,337
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:57 pmPDX - USM
3 stops28h 58mMultiple Airlines
Thu 3/262:05 pmUSM - PDX
3 stops21h 33mMultiple Airlines
Deal found 12/29$1,338

Find 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 January 1, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$921
(oojo)

One-way from

$506
(oojo)
Provider with most accurate pricing for Seattle/Tacoma Intl-Ko Samui flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Ko Samui flights.
Search Deals
From Washington to Ko Samui
Search Deals
One-way flight from Washington to Ko Samui
Search Deals

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 January 1, 2026.
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

Sun 2/15

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Tue 2/24

7:45 pm-7:10 am

1 stop50h 25m

$1,099

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 2/14

12:10 am-5:40 pm

2 stops26h 30m

Ko Samui

Tue 2/24

7:10 pm-6:10 pm

2 stops38h 00m

$1,126

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 3/27

1:10 am-2:45 pm

2 stops23h 35m

Ko Samui

Sun 4/5

8:50 pm-7:30 pm

2 stops36h 40m

$1,187

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/2

3:15 pm-6:15 pm

2 stops37h 00m

Ko Samui

Thu 4/23

6:55 pm-9:15 am

2 stops28h 20m

$1,189

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 2/1

9:50 am-12:15 pm

2 stops35h 25m

Ko Samui

Sat 2/14

7:45 pm-6:30 pm

2 stops37h 45m

$1,204

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 1/22

7:00 pm-1:05 pm

2 stops27h 05m

Ko Samui

Tue 1/27

7:30 pm-2:40 pm

2 stops34h 10m

$1,207

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 2/21

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Thu 3/5

8:55 am-7:10 am

1 stop37h 15m

$1,210

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 2/21

8:45 am-8:00 am

1 stop32h 15m

Ko Samui

Thu 3/5

8:30 am-3:05 pm

2 stops21h 35m

$1,262

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 2/12

12:10 am-5:00 pm

2 stops25h 50m

Ko Samui

Fri 2/20

7:00 pm-6:10 pm

2 stops38h 10m

$1,302

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 2/14

11:30 pm-4:00 pm

2 stops25h 30m

Ko Samui

Sat 2/21

11:40 am-6:10 pm

2 stops21h 30m

$1,337

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 15 results
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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 January 1, 2026.

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 26h 30m. The time it takes to get you to your destination can typically vary by up to 5h 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 January 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$859Average$1,066FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$999Average$1,258FlexibilityNo cancel feeOn-time74%

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