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Ko Samui

$543+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
Apr 1 — Apr 81
Tue 4/1
Tue 4/8
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 March 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,046
(FlightHub)

One-way from

$543
(Trip.com)

Popular in

July

Cheapest in

August

Average price

$1,057
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 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. 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 March 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 March 27, 2025.

This Ovago deal was found by Cheapflights users on 3/26. 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.
Tue 10/2110:15 amSEA - USM
1 stop31h 35mSingapore Airlines
Wed 11/511:45 amUSM - SEA
1 stop34h 25mSingapore Airlines
Deal found 3/26$960
This Justfly.com deal was found by Cheapflights users on 3/26. 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.
Mon 10/201:30 amSEA - USM
2 stops30h 05mEVA Air
Wed 11/510:00 amUSM - SEA
2 stops23h 10mEVA Air
Deal found 3/26$996
This FlightHub deal was found by Cheapflights users on 3/26. 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 8/311:40 amSEA - USM
2 stops21h 05mMultiple Airlines
Thu 9/42:35 pmUSM - SEA
2 stops19h 10mMultiple Airlines
Deal found 3/26$1,046
This Gotogate deal was found by Cheapflights users on 3/25. 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.
Thu 5/81:10 amSEA - USM
2 stops41h 05mChina Airlines
Fri 5/167:15 pmUSM - SEA
2 stops38h 15mChina Airlines
Deal found 3/25$1,183
This oojo deal was found by Cheapflights users on 3/26. 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.
Sat 5/104:30 pmSEA - USM
2 stops29h 25mQatar Airways
Sat 5/175:55 pmUSM - SEA
2 stops56h 50mQatar Airways
Deal found 3/26$1,201
This FlightHub deal was found by Cheapflights users on 3/24. 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.
Mon 6/167:10 pmSEA - USM
2 stops36h 25mTurkish Airlines
Tue 6/247:10 pmUSM - SEA
2 stops36h 05mTurkish Airlines
Deal found 3/24$1,374
This Emirates deal was found by Cheapflights users on 3/24. 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 5/95:15 pmSEA - USM
2 stops61h 55mEmirates
Fri 5/164:25 pmUSM - SEA
2 stops59h 00mEmirates
Deal found 3/24$1,816
This Gurufare deal was found by Cheapflights users on 3/24. 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.
Mon 6/168:10 amSEA - USM
3 stops33h 10mCathay Pacific
Tue 6/2410:55 amUSM - SEA
2 stops26h 07mCathay Pacific
Deal found 3/24$2,162
This Flightnetwork deal was found by Cheapflights users on 3/25. 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.
Tue 7/291:30 pmSEA - USM
3 stops37h 20mMalaysia Airlines
Sat 8/91:50 pmUSM - SEA
3 stops34h 45mMalaysia Airlines
Deal found 3/25$9,847
This business-class.com deal was found by Cheapflights users on 3/25. 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 business-class.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/298:10 amSEA - USM
3 stops34h 05mJapan Airlines
Sat 8/97:10 pmUSM - SEA
3 stops35h 49mJapan Airlines
Deal found 3/25$18,585

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 March 27, 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

Mon 5/5

1:50 am-2:45 pm

2 stops22h 55m

Ko Samui

Tue 5/13

10:05 am-7:30 pm

2 stops23h 25m

$1,019

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Tue 5/6

8:13 am-7:20 am

3 stops33h 07m

Ko Samui

Tue 5/13

8:00 am-6:50 pm

2 stops24h 50m

$1,156

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Thu 5/8

1:10 am-8:15 am

2 stops41h 05m

Ko Samui

Fri 5/16

7:15 pm-7:30 pm

2 stops38h 15m

$1,183

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 5/10

4:30 pm-11:55 am

2 stops29h 25m

Ko Samui

Sat 5/17

5:55 pm-12:45 pm

2 stops56h 50m

$1,201

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sat 5/10

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

Sat 5/17

12:05 pm-8:45 am

1 stop34h 40m

$1,211

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 5/9

7:10 pm-8:15 am

2 stops47h 05m

Ko Samui

Fri 5/16

5:25 pm-5:15 pm

2 stops37h 50m

$1,297

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 5/9

5:15 pm-9:10 pm

2 stops61h 55m

Ko Samui

Fri 5/16

4:25 pm-1:25 pm

2 stops59h 00m

$1,816

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Mon 6/16

8:10 am-7:20 am

3 stops33h 10m

Ko Samui

Tue 6/24

10:55 am-11:02 pm

2 stops26h 07m

$2,162

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Sun 4/20

10:15 am-8:45 pm

2 stops44h 30m

$543

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

Fri 5/9

5:15 pm-9:10 pm

2 stops37h 55m

$2,911

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Compare providers for flights from Seattle to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Ko Samui in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Ko Samui flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Ko Samui flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Ko Samui flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Ko Samui flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 27, 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 35% 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 23, 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.

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 27, 2025.
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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
1,169 reviews
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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.
China Airlines
8.2
Very good
722 reviews
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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
1,284 reviews
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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
3,190 reviews
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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.
Qatar Airways
7.4
Good
3,538 reviews
EVA Air
8.4
Very good
1,169 reviews

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

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 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?

    EVA Air, at $1,132, was found to be the cheapest airline from Seattle to Ko Samui.Alternate airlines to your destination round-trip include China Airlines and Qatar Airways. You may be able to fly from Seattle to Ko Samui for 17% less than the average price by searching for these airlines.

  • 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 March 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,057Average$1,376FlexibilityNo cancel feeOn-time74%
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