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Koh Samui

$530+ Cheap flights from Washington to Koh 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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Washington to Koh Samui

Discover tips and strategies to find the most affordable flight options for your journey from Washington (USWA) to Koh Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,069
(Trip.com)

One-way from

$530
(Kiwi.com)
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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Find flight deals from Washington to Koh Samui

Cheapest flights from Washington to Koh Samui
Explore the most affordable flight options available from Washington to Koh Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.

This Trip.com deal was found by Cheapflights users on 1/30. 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.
Sun 3/1612:00 pmSEA - USM
2 stops42h 55mMultiple Airlines
Sun 3/238:20 amUSM - SEA
2 stops39h 40mMultiple Airlines
Deal found 1/30$1,069
This flugladen.de deal was found by Cheapflights users on 1/29. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1111:50 pmSEA - USM
2 stops25h 50mEVA Air
Tue 3/188:30 amUSM - SEA
2 stops24h 40mEVA Air
Deal found 1/29$1,078
This FlightHub deal was found by Cheapflights users on 1/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/138:40 amSEA - USM
1 stop32h 20mSingapore Airlines
Fri 3/148:55 amUSM - SEA
1 stop37h 15mSingapore Airlines
Deal found 1/29$1,082
This FlightHub deal was found by Cheapflights users on 1/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/64:30 pmSEA - USM
2 stops28h 00mQatar Airways
Sat 4/127:00 pmUSM - SEA
2 stops31h 30mQatar Airways
Deal found 1/29$1,151
This Kissandfly.com deal was found by Cheapflights users on 1/29. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/37:32 pmSEA - USM
2 stops31h 43mBangkok Airways
Mon 3/1011:40 amUSM - SEA
2 stops27h 15mBangkok Airways
Deal found 1/29$1,250
This CheapOair deal was found by Cheapflights users on 1/30. 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.
Wed 3/263:25 pmPDX - USM
2 stops35h 45mMultiple Airlines
Wed 4/94:25 pmUSM - PDX
2 stops43h 45mMultiple Airlines
Deal found 1/30$1,628
This Gurufare deal was found by Cheapflights users on 1/30. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/267:00 amPDX - USM
3 stops45h 15mSingapore Airlines
Wed 4/91:30 pmUSM - PDX
2 stops36h 55mSingapore Airlines
Deal found 1/30$2,326
This Qatar Airways deal was found by Cheapflights users on 1/30. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2611:36 amPDX - USM
3 stops31h 04mQatar Airways
Fri 4/119:10 pmUSM - PDX
3 stops36h 12mQatar Airways
Deal found 1/30$2,344
This Emirates deal was found by Cheapflights users on 1/30. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/165:05 pmSEA - USM
2 stops35h 10mEmirates
Sun 3/238:15 amUSM - SEA
2 stops43h 20mEmirates
Deal found 1/30$2,572

Find flights from Washington to Koh Samui within your budget

Customize your flight search to find flights from Washington to Koh 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 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 3/16

12:00 pm-8:55 pm

2 stops42h 55m

Ko Samui

Sun 3/23

8:20 am-10:00 am

2 stops39h 40m

$1,069

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 3/11

11:50 pm-3:40 pm

2 stops25h 50m

Ko Samui

Tue 3/18

8:30 am-7:10 pm

2 stops24h 40m

$1,078

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 2/13

8:40 am-8:00 am

1 stop32h 20m

Ko Samui

Fri 3/14

8:55 am-8:10 am

1 stop37h 15m

$1,082

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/6

4:30 pm-10:30 am

2 stops28h 00m

Ko Samui

Sat 4/12

7:00 pm-12:30 pm

2 stops31h 30m

$1,151

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 3/3

7:32 pm-6:15 pm

2 stops31h 43m

Ko Samui

Mon 3/10

11:40 am-12:55 am

2 stops27h 15m

$1,250

PortlandKoh Samui

PDX - USM

PDXUSM

Portland

Wed 3/26

3:25 pm-5:10 pm

2 stops35h 45m

Ko Samui

Wed 4/9

4:25 pm-10:10 pm

2 stops43h 45m

$1,628

PortlandKoh Samui

PDX - USM

PDXUSM

Portland

Wed 3/26

7:00 am-6:15 pm

3 stops45h 15m

Ko Samui

Wed 4/9

1:30 pm-12:25 pm

2 stops36h 55m

$2,326

PortlandKoh Samui

PDX - USM

PDXUSM

Portland

Wed 3/26

11:36 am-8:40 am

3 stops31h 04m

Ko Samui

Fri 4/11

9:10 pm-7:22 pm

3 stops36h 12m

$2,344

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 3/16

5:05 pm-6:15 pm

2 stops35h 10m

Ko Samui

Sun 3/23

11:10 am-1:35 pm

2 stops40h 25m

$3,983

SeattleKoh Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 3/16

9:40 am-8:00 am

1 stop32h 20m

$530

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 15 results
1
2

Best time to book a flight from Washington to Koh Samui

Have a flexible travel schedule? Discover the best time to fly to Koh 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.

Travel insights for flights from Washington to Koh Samui

Get recent, data-driven insights about flights from Washington to Koh Samui including ideal travel times, pricing trends, and more.

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

Find hourly flight availability from Washington to Koh 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 30, 2025.

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

Rainfall in Koh Samui by month

Plan your trip to Koh Samui by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Koh Samui ranges from 2.3 - 19.3 inches per month. November is typically the wettest month, when rainfall can reach 19.3 in. February is typically the driest time to visit Koh Samui when rainfall is around 2.3 in.

Temperature in Koh Samui by month

Plan your trip to Koh Samui by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Koh Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).

Reviews of airlines servicing Koh Samui

Get insights into the airlines that provide service to Koh Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Koh Samui. Reviews last updated January 30, 2025.
Read reviews from past customers who have flown EVA Air, China Airlines and Emirates from Washington to Koh Samui. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

EVA Air
8.4
Very good
1,236 reviews
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

China Airlines
8.2
Very good
726 reviews
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

Emirates
8.1
Very good
3,330 reviews
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

Singapore Airlines
8.1
Very good
1,317 reviews
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

Bangkok Airways
8.1
Very good
127 reviews
EVA Air
8.4
Very good
1,236 reviews

Food

8.0

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Crew

8.6

Reviews

1 / 20

10.0
Excellent

Paul,Jan 2025

DPS - TPE

Excellent crew, smooth flight, good food and service. We have flown with other carriers but this one is the best so far.

Related info for your journey

Find useful and relevant information for your journey from Washington to Koh 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 Koh Samui from Washington?

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

  • What are the cheapest airlines to fly from State of Washington to Koh Samui one-way?

    To fly one-way, consider booking your trip with Qatar Airways, which is currently one of the cheapest options available, starting at $587. China Airlines flights start at $666 while deals on EVA Air start at $731 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Koh 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 Washington?

Book flights to Washington if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao

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Alternative routes for Washington to Koh Samui

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Top airline flying from Washington to Koh Samui

Discover the top airline that operate flights from Washington to Koh 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,057Average$1,417FlexibilityNo cancel feeOn-time74%
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