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Ko Samui

$577+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,219
(FlightHub)

One-way from

$577
(Kiwi.com)

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 April 30, 2025.

This Singapore Airlines deal was found by Cheapflights users on 4/29. 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 Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:45 amSEA - USM
1 stop32h 15mMultiple Airlines
Sun 11/309:25 pmUSM - SEA
2 stops48h 45mMultiple Airlines
Deal found 4/29$975
This FlightHub deal was found by Cheapflights users on 4/29. 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.
Wed 10/291:10 amSEA - USM
2 stops23h 45mEVA Air
Sun 11/308:30 pmUSM - SEA
2 stops36h 40mEVA Air
Deal found 4/29$1,019
This FlightHub deal was found by Cheapflights users on 4/29. 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.
Tue 6/310:15 amSEA - USM
1 stop31h 35mSingapore Airlines
Thu 6/127:25 pmUSM - SEA
1 stop27h 20mSingapore Airlines
Deal found 4/29$1,219
This Qatar Airways deal was found by Cheapflights users on 4/29. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/314:30 pmSEA - USM
2 stops31h 25mQatar Airways
Wed 6/115:55 pmUSM - SEA
2 stops56h 50mQatar Airways
Deal found 4/29$1,329
This FlightHub deal was found by Cheapflights users on 4/29. 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 6/17:10 pmSEA - USM
2 stops47h 05mTurkish Airlines
Wed 6/118:00 amUSM - SEA
2 stops40h 35mTurkish Airlines
Deal found 4/29$1,351
This Orbitz deal was found by Cheapflights users on 4/28. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/289:45 pmPDX - USM
2 stops33h 25mMultiple Airlines
Wed 6/41:30 pmUSM - PDX
2 stops36h 22mMultiple Airlines
Deal found 4/28$1,554
This Emirates deal was found by Cheapflights users on 4/29. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/135:15 pmSEA - USM
2 stops37h 55mEmirates
Fri 6/208:00 amUSM - SEA
2 stops43h 25mEmirates
Deal found 4/29$2,416
This Qatar Airways deal was found by Cheapflights users on 4/28. 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.
Thu 12/2510:35 amPDX - USM
3 stops33h 00mQatar Airways
Fri 1/29:25 pmUSM - PDX
3 stops34h 24mQatar Airways
Deal found 4/28$3,115
This Gotogate deal was found by Cheapflights users on 4/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/101:30 pmSEA - USM
3 stops34h 15mMalaysia Airlines
Tue 6/173:20 pmUSM - SEA
3 stops33h 15mMalaysia Airlines
Deal found 4/29$3,303

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 April 30, 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

Tue 6/3

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Thu 6/12

7:25 pm-8:45 am

1 stop27h 20m

$1,219

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 5/28

7:10 pm-6:15 pm

2 stops57h 05m

Ko Samui

Wed 6/4

7:30 pm-5:15 pm

2 stops35h 45m

$1,296

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 5/31

4:30 pm-1:55 pm

2 stops31h 25m

Ko Samui

Mon 6/9

5:55 pm-12:45 pm

2 stops56h 50m

$1,329

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 6/1

7:10 pm-8:15 am

2 stops47h 05m

Ko Samui

Wed 6/11

8:00 am-10:35 am

2 stops40h 35m

$1,351

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 7/1

2:10 am-3:10 pm

2 stops23h 00m

Ko Samui

Wed 7/23

9:00 pm-7:10 pm

2 stops36h 10m

$1,482

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 5/28

9:45 pm-9:10 pm

2 stops33h 25m

Ko Samui

Wed 6/4

1:30 pm-11:52 am

2 stops36h 22m

$1,554

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 6/13

5:15 pm-9:10 pm

2 stops37h 55m

Ko Samui

Fri 6/20

8:00 am-1:25 pm

2 stops43h 25m

$2,416

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 6/10

1:30 pm-1:45 pm

3 stops34h 15m

Ko Samui

Tue 6/17

3:20 pm-10:35 am

3 stops33h 15m

$3,303

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/14

1:10 am-9:35 pm

3 stops30h 25m

$577

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 10/14

1:30 am-1:45 pm

2 stops22h 15m

$593

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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 April 30, 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 April 30, 2025.
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop
EVA Air
8.4
Very good
1,186 reviews
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop
Singapore Airlines
8.1
Very good
1,292 reviews
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop
Emirates
8.0
Very good
3,215 reviews
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop
Qatar Airways
7.4
Good
3,563 reviews
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop
Turkish Airlines
7.3
Good
3,788 reviews
EVA Air
8.4
Very good
1,186 reviews

Entertainment

8.0

Comfort

8.3

Food

8.1

Boarding

8.4

Overall

8.4

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

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 EVA Air. According to our data, you can fly for as low as $593. Users have also found prices from $692 and $922 on Turkish Airlines and Qatar Airways, 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,057Average$1,376FlexibilityNo cancel feeOn-time74%

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