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Ko Samui

$599+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
abr. 22 — abr. 291
mar. 4/22
mar. 4/29
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 abril 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,003
(Singapore Airlines)

One-way from

$624
(Gotogate)

Popular in

July

Cheapest in

August

Average price

$1,376
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. 13% potential increase in price ($209 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($79 potential savings vs. average RT price).
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Average for round-trip flights in April 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 abril 17, 2025.

This Singapore Airlines deal was found by Cheapflights users on 4/16. 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 Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/410:15 amSEA - USM
1 stop31h 35mSingapore Airlines
sáb. 10/118:45 amUSM - SEA
1 stop38h 00mSingapore Airlines
Deal found 4/16$1,003
This Justfly.com deal was found by Cheapflights users on 4/16. 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.
vie. 10/31:30 amSEA - USM
2 stops30h 05mEVA Air
sáb. 10/112:00 pmUSM - SEA
2 stops18h 50mEVA Air
Deal found 4/16$1,073
This oojo deal was found by Cheapflights users on 4/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/44:30 pmSEA - USM
2 stops28h 00mMultiple Airlines
sáb. 10/1112:10 pmUSM - SEA
2 stops38h 35mMultiple Airlines
Deal found 4/16$1,134
This Flightnetwork deal was found by Cheapflights users on 4/16. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/314:30 pmSEA - USM
2 stops29h 25mQatar Airways
sáb. 6/75:55 pmUSM - SEA
2 stops56h 50mQatar Airways
Deal found 4/16$1,347
This FlightHub deal was found by Cheapflights users on 4/16. 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.
dom. 10/121:10 amSEA - USM
2 stops21h 35mChina Airlines
lun. 10/202:35 pmUSM - SEA
2 stops18h 45mChina Airlines
Deal found 4/16$1,829
This StudentUniverse deal was found by Cheapflights users on 4/17. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/11:30 pmSEA - USM
2 stops28h 45mJapan Airlines
dom. 6/87:10 pmUSM - SEA
3 stops35h 40mJapan Airlines
Deal found 4/17$2,049
This Gurufare deal was found by Cheapflights users on 4/16. 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.
lun. 6/1611:44 amSEA - USM
3 stops29h 36mCathay Pacific
mar. 6/2410:55 amUSM - SEA
2 stops26h 07mCathay Pacific
Deal found 4/16$2,125
This Gurufare deal was found by Cheapflights users on 4/16. 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.
mié. 4/305:39 pmPDX - USM
2 stops34h 56mCathay Pacific
sáb. 5/310:55 amUSM - PDX
2 stops23h 42mCathay Pacific
Deal found 4/16$2,279
This Gotogate deal was found by Cheapflights users on 4/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/301:15 pmPDX - USM
3 stops31h 15mMultiple Airlines
sáb. 5/34:25 pmUSM - PDX
2 stops36h 15mMultiple Airlines
Deal found 4/16$2,334
This Emirates deal was found by Cheapflights users on 4/17. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/15:15 pmSEA - USM
2 stops37h 55mEmirates
dom. 6/88:00 amUSM - SEA
2 stops43h 25mEmirates
Deal found 4/17$2,416
This Qatar Airways deal was found by Cheapflights users on 4/16. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/2510:35 amPDX - USM
3 stops33h 00mQatar Airways
vie. 1/27:10 pmUSM - PDX
3 stops34h 39mQatar Airways
Deal found 4/16$3,115

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 abril 17, 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

sáb. 10/4

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

sáb. 10/11

8:45 am-8:45 am

1 stop38h 00m

$1,003

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

vie. 10/3

1:30 am-9:35 pm

2 stops30h 05m

Ko Samui

sáb. 10/11

2:00 pm-6:50 pm

2 stops18h 50m

$1,073

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 10/4

4:30 pm-10:30 am

2 stops28h 00m

Ko Samui

sáb. 10/11

12:10 pm-12:45 pm

2 stops38h 35m

$1,134

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

sáb. 5/31

4:30 pm-11:55 am

2 stops29h 25m

Ko Samui

sáb. 6/7

5:55 pm-12:45 pm

2 stops56h 50m

$1,347

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 10/12

1:10 am-12:45 pm

2 stops21h 35m

Ko Samui

lun. 10/20

2:35 pm-7:20 pm

2 stops18h 45m

$1,829

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 6/1

1:30 pm-8:15 am

2 stops28h 45m

Ko Samui

dom. 6/8

7:10 pm-4:50 pm

3 stops35h 40m

$2,049

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

lun. 6/16

11:44 am-7:20 am

3 stops29h 36m

Ko Samui

mar. 6/24

10:55 am-11:02 pm

2 stops26h 07m

$2,125

PortlandKo Samui

PDX - USM

PDXUSM

Portland

mié. 4/30

5:39 pm-6:35 pm

2 stops34h 56m

Ko Samui

sáb. 5/3

10:55 am-8:37 pm

2 stops23h 42m

$2,279

PortlandKo Samui

PDX - USM

PDXUSM

Portland

mié. 4/30

1:15 pm-10:30 am

3 stops31h 15m

Ko Samui

sáb. 5/3

4:25 pm-2:40 pm

2 stops36h 15m

$2,334

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

dom. 6/1

5:15 pm-9:10 pm

2 stops37h 55m

Ko Samui

dom. 6/8

8:00 am-1:25 pm

2 stops43h 25m

$2,416

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 15 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 abril 17, 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 abril 17, 2025.
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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
1,177 reviews
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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
1,440 reviews
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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.
China Airlines
8.2
Very good
729 reviews
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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
1,288 reviews
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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
3,200 reviews
EVA Air
8.4
Very good
1,177 reviews

Comfort

8.3

Overall

8.4

Food

8.1

Crew

8.6

Boarding

8.4

Entertainment

8.0

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.

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

    For one-way options, check prices for Qatar Airways. According to our data, you can fly for as low as $624. Users have also found prices from $782 and $806 on Singapore Airlines and EVA Air, respectively.

  • 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 Tao
Ko Pha Ngan

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Alternative routes for Washington to Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.
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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 abril 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,057Average$1,376FlexibilityNo cancel feeOn-time74%

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