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Ko Samui

$561+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Mar 15 — Mar 221
Sat 3/15
Sat 3/22
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 March 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$985
(SmartFares)

One-way from

$561
(SmartFares)
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 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 March 10, 2025.

This SmartFares deal was found by Cheapflights users on 3/9. 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.
Sun 4/201:10 amSEA - USM
2 stops40h 10mMultiple Airlines
Mon 4/282:00 pmUSM - SEA
2 stops19h 30mMultiple Airlines
Deal found 3/9$985
This FlightHub deal was found by Cheapflights users on 3/8. 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 11/168:45 amSEA - USM
1 stop32h 15mSingapore Airlines
Sat 11/2211:45 amUSM - SEA
1 stop34h 25mSingapore Airlines
Deal found 3/8$1,009
This Booking.com deal was found by Cheapflights users on 3/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/211:30 amSEA - USM
2 stops22h 15mEVA Air
Tue 4/292:00 pmUSM - SEA
2 stops19h 30mEVA Air
Deal found 3/10$1,052
This Flightnetwork deal was found by Cheapflights users on 3/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/237:10 pmSEA - USM
2 stops35h 50mTurkish Airlines
Wed 4/307:30 pmUSM - SEA
2 stops35h 45mTurkish Airlines
Deal found 3/9$1,297
This Ovago deal was found by Cheapflights users on 3/9. 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.
Sun 6/151:10 amSEA - USM
2 stops23h 35mChina Airlines
Tue 6/249:30 amUSM - SEA
2 stops24h 00mChina Airlines
Deal found 3/9$1,678
This Gurufare deal was found by Cheapflights users on 3/10. 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.
Sat 3/228:55 pmPDX - USM
2 stops56h 40mCathay Pacific
Thu 4/310:55 amUSM - PDX
2 stops24h 04mCathay Pacific
Deal found 3/10$1,874
This Mytrip deal was found by Cheapflights users on 3/10. 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 3/227:05 pmPDX - USM
2 stops23h 05mMultiple Airlines
Thu 4/33:50 pmUSM - PDX
3 stops35h 30mMultiple Airlines
Deal found 3/10$2,111
This StudentUniverse deal was found by Cheapflights users on 3/9. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/218:00 amSEA - USM
3 stops34h 15mJapan Airlines
Mon 4/287:10 pmUSM - SEA
3 stops35h 30mJapan Airlines
Deal found 3/9$2,222
This Emirates deal was found by Cheapflights users on 3/9. 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.
Wed 4/235:15 pmSEA - USM
2 stops61h 55mEmirates
Wed 4/308:00 amUSM - SEA
2 stops43h 25mEmirates
Deal found 3/9$2,560
This Qatar Airways deal was found by Cheapflights users on 3/10. 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.
Sat 3/2211:29 amPDX - USM
3 stops33h 06mQatar Airways
Thu 4/39:00 pmUSM - PDX
3 stops35h 23mQatar Airways
Deal found 3/10$3,688

Find flights from Washington to Ko Samui within your budget

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 March 10, 2025.

Fly from

Washington

Fly to

Ko Samui

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/20

1:10 am-7:20 am

2 stops40h 10m

Ko Samui

Mon 4/28

2:00 pm-7:30 pm

2 stops19h 30m

$985

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 4/21

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Tue 4/29

2:00 pm-7:30 pm

2 stops19h 30m

$1,052

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 4/23

7:10 pm-9:00 pm

2 stops35h 50m

Ko Samui

Wed 4/30

7:30 pm-5:15 pm

2 stops35h 45m

$1,297

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sat 3/22

8:55 pm-7:35 pm

2 stops56h 40m

Ko Samui

Thu 4/3

10:55 am-8:59 pm

2 stops24h 04m

$1,874

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sat 3/22

7:05 pm-8:10 am

2 stops23h 05m

Ko Samui

Thu 4/3

3:50 pm-1:20 pm

3 stops35h 30m

$2,111

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 4/23

7:00 am-6:15 pm

2 stops45h 15m

Ko Samui

Wed 4/30

7:25 pm-8:45 am

1 stop27h 20m

$2,188

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 4/21

8:00 am-8:15 am

3 stops34h 15m

Ko Samui

Mon 4/28

7:10 pm-4:40 pm

3 stops35h 30m

$2,222

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 4/23

5:15 pm-9:10 pm

2 stops61h 55m

Ko Samui

Wed 4/30

8:00 am-1:25 pm

2 stops43h 25m

$2,560

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sat 3/22

11:29 am-10:35 am

3 stops33h 06m

Ko Samui

Thu 4/3

9:00 pm-6:23 pm

3 stops35h 23m

$3,688

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 4/29

1:10 am-8:30 pm

2 stops29h 20m

$561

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Showing 1-10 of 12 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.

Travel insights for flights from Washington to Ko Samui

Get recent, data-driven insights about flights from Washington to Ko 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 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 March 10, 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.

Rainfall in Ko Samui by month

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

In terms of precipitation, rainfall in Ko 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 Ko Samui when rainfall is around 2.3 in.

Temperature in Ko Samui by month

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

If weather is an important factor for your trip to Ko 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 Ko Samui

Get insights into the airlines that provide service to Ko 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 Ko Samui. Reviews last updated March 10, 2025.
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

EVA Air
8.4
Very good
1,179 reviews
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Japan Airlines
8.3
Very good
1,439 reviews
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Singapore Airlines
8.1
Very good
1,283 reviews
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Emirates
8.0
Very good
3,219 reviews
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Cathay Pacific
7.5
Good
828 reviews
EVA Air
8.4
Very good
1,179 reviews

Boarding

8.4

Overall

8.4

Comfort

8.3

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

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.

  • 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 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 Ko Samui

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Top airline flying from Washington to Ko Samui

Discover the top airline 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 March 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,057Average$1,384FlexibilityNo cancel feeOn-time74%
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