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Ko Samui

$585+ Cheap flights from Seattle (SEA) 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheap flight deals from Seattle to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Ko 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 June 30, 2025.

Round-trip from

$905
(Trip.com)

One-way from

$585
(EaseMyTrip)

Popular in

July

Cheapest in

March

Average price

$1,707
From Seattle/Tacoma Intl to Ko Samui
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One-way flight from Seattle/Tacoma Intl to Ko Samui
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Highest demand for flights based on searches. 16% potential increase in price ($256 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($82 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Seattle to Ko Samui

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

This Trip.com deal was found by Cheapflights users on 6/30. 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.
Sat 9/2012:50 pmSEA - USM
2 stops42h 00mMultiple Airlines
Sun 9/287:00 amUSM - SEA
2 stops41h 40mMultiple Airlines
Deal found 6/30$905
This CheapTickets deal was found by Cheapflights users on 6/29. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/134:30 pmSEA - USM
2 stops34h 35mANA
Wed 8/201:30 pmUSM - SEA
2 stops36h 37mANA
Deal found 6/29$918
This FlightHub deal was found by Cheapflights users on 6/30. 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 9/191:30 amSEA - USM
2 stops22h 15mEVA Air
Sun 9/289:00 pmUSM - SEA
2 stops36h 30mEVA Air
Deal found 6/30$1,040
This Singapore Airlines deal was found by Cheapflights users on 6/29. 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.
Sun 10/1910:15 amSEA - USM
1 stop31h 35mSingapore Airlines
Wed 10/227:25 pmUSM - SEA
1 stop27h 20mSingapore Airlines
Deal found 6/29$1,049
This Turkish Airlines deal was found by Cheapflights users on 6/29. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/197:10 pmSEA - USM
2 stops28h 35mTurkish Airlines
Wed 10/227:30 pmUSM - SEA
2 stops35h 45mTurkish Airlines
Deal found 6/29$1,382
This Emirates deal was found by Cheapflights users on 6/27. 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 10/195:15 pmSEA - USM
2 stops29h 30mEmirates
Wed 10/222:00 pmUSM - SEA
2 stops37h 25mEmirates
Deal found 6/27$1,440
This Qatar Airways deal was found by Cheapflights users on 6/28. 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.
Sun 10/194:30 pmSEA - USM
2 stops28h 00mQatar Airways
Wed 10/229:00 pmUSM - SEA
2 stops29h 45mQatar Airways
Deal found 6/28$1,449
This British Airways deal was found by Cheapflights users on 6/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:50 pmSEA - USM
2 stops35h 15mBritish Airways
Thu 1/11:25 pmUSM - SEA
2 stops36h 55mBritish Airways
Deal found 6/28$3,079

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle 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 June 30, 2025.
Use the filters below to find and compare flights from Seattle to Ko Samui that are best for you.

Fly from

Seattle

Fly to

Ko Samui

Route

Depart

Return

Price

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 9/20

12:50 pm-8:50 pm

2 stops42h 00m

Ko Samui

Sun 9/28

7:00 am-10:40 am

2 stops41h 40m

$905

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 8/13

4:30 pm-5:05 pm

2 stops34h 35m

Ko Samui

Wed 8/20

1:30 pm-12:07 pm

2 stops36h 37m

$918

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 9/19

1:30 am-1:45 pm

2 stops22h 15m

Ko Samui

Sun 9/28

9:00 pm-7:30 pm

2 stops36h 30m

$1,040

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 8/13

6:09 pm-6:15 pm

2 stops34h 06m

Ko Samui

Wed 8/20

7:25 pm-8:45 am

1 stop27h 20m

$2,208

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 8/12

1:40 am-4:40 pm

2 stops25h 00m

$585

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 8/13

4:30 pm-10:30 am

2 stops28h 00m

$628

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Wed 8/13

1:30 pm-5:05 pm

3 stops37h 35m

$1,773

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

The best insider tips for Seattle to Ko Samui flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Ko Samui trip
Airlines
Alaska Airlines

Enjoy free cocktails in Premium Class, though snacks and meals require purchase or pre-order.


Alaska Airlines offers Wi-Fi for a flat fee, ideal for long flights to stay productive.

Read more about Alaska Airlinesby Robert Schrader
Sun Country Air

Sun Country's priority check-in includes access to priority security lanes for a smoother experience.


Sun Country offers free inflight entertainment streamed to your device, but no onboard internet access.

Read more about Sun Country Airby Jennifer Simonson
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Jennifer Simonson

Jennifer Simonson

Expert on Sun Country Air

Jennifer Simonson

Jennifer Simonson

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more

Best time to book a flight from Seattle to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Seattle 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 Seattle to Ko Samui

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

Find hourly flight availability from Seattle 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 June 30, 2025.

When flying from Seattle to Ko Samui, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 33% versus a flight in the evening.

What is the cheapest day to fly from Seattle to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Seattle 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.

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 June 30, 2025.
Read reviews from past customers who have flown EVA Air, ANA, and Emirates from Seattle to Ko Samui. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,210 reviews
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
ANA
8.4
Very good
892 reviews
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Emirates
8.1
Very good
3,285 reviews
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Singapore Airlines
8.1
Very good
1,319 reviews
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Qatar Airways
7.4
Good
3,596 reviews
EVA Air
8.4
Very good
1,210 reviews

Boarding

8.4

Entertainment

8.0

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

Related info for your journey

Find useful and relevant information for your journey from Seattle 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 are the cheapest airlines flying from Seattle to Ko Samui round-trip?

    ANA, at $918, was found to be the cheapest airline from Seattle to Ko Samui.Alternate airlines to your destination round-trip include EVA Air and Singapore Airlines. You may be able to fly from Seattle to Ko Samui for 31% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Ko Samui one-way?

    $619 is the cheapest one-way deal found within the past few days, from Qatar Airways. You may also be able to find cheap deals on Singapore Airlines and Malaysia Airlines, with prices starting from $713 and $1,773, respectively.

  • Can I find deals for flights from Seattle to Ko Samui that include hotel bookings?

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

  • How can I find direct flights from Seattle to Ko Samui?

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

  • Can I find deals for business class flights from Seattle to Ko Samui?

    Yes. Cheapflights offers flight deals from Seattle 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 Seattle?

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

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Top airline flying from Seattle to Ko Samui

Discover the top airline that operate flights from Seattle 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$999Average$1,351FlexibilityNo cancel feeOn-time74%

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