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Ko Samui

$1,039+ Cheap flights from Seattle (SEA) to Ko Samui (USM)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — USM
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$1,122
(Ovago)

Popular in

July

Cheapest in

March

Average price

$1,707
From Seattle/Tacoma Intl to Ko Samui
Search Deals
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 junio 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/212:30 amSEA - USM
2 stops30h 00mEVA Air
dom. 10/198:50 pmUSM - SEA
2 stops36h 40mEVA Air
Deal found 6/10$1,039
This Ovago deal was found by Cheapflights users on 6/9. 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.
mié. 8/201:15 amSEA - USM
2 stops23h 50mMultiple Airlines
lun. 9/19:15 amUSM - SEA
2 stops20h 55mMultiple Airlines
Deal found 6/9$1,122
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/37:10 pmSEA - USM
2 stops47h 05mTurkish Airlines
dom. 10/199:00 pmUSM - SEA
2 stops34h 15mTurkish Airlines
Deal found 6/10$1,252
This Ovago deal was found by Cheapflights users on 6/10. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/310:15 amSEA - USM
1 stop34h 55mSingapore Airlines
dom. 10/191:30 pmUSM - SEA
2 stops41h 24mSingapore Airlines
Deal found 6/10$1,253
This FlightHub deal was found by Cheapflights users on 6/11. 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.
lun. 6/164:30 pmSEA - USM
2 stops28h 00mQatar Airways
mar. 6/245:55 pmUSM - SEA
2 stops32h 50mQatar Airways
Deal found 6/11$1,462
This business-class.com deal was found by Cheapflights users on 6/11. 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.
lun. 6/307:55 pmSEA - USM
2 stops32h 40mCathay Pacific
mar. 7/229:15 amUSM - SEA
3 stops45h 22mCathay Pacific
Deal found 6/11$8,752

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 junio 12, 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

mié. 8/20

1:15 am-3:05 pm

2 stops23h 50m

Ko Samui

lun. 9/1

9:15 am-4:10 pm

2 stops20h 55m

$1,122

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 8/21

10:15 am-7:50 am

1 stop31h 35m

Ko Samui

lun. 9/1

7:25 pm-8:45 am

1 stop27h 20m

$1,292

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

jue. 7/24

2:10 am-4:35 pm

2 stops24h 25m

Ko Samui

vie. 8/1

9:15 am-7:50 pm

2 stops24h 35m

$1,432

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

lun. 6/16

4:30 pm-10:30 am

2 stops28h 00m

Ko Samui

mar. 6/24

5:55 pm-12:45 pm

2 stops32h 50m

$1,462

SeattleKo Samui

SEA - USM

SEAUSM

Seattle/Tacoma Intl

lun. 6/30

7:55 pm-6:35 pm

2 stops32h 40m

Ko Samui

mar. 7/22

9:15 am-4:37 pm

3 stops45h 22m

$8,752

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

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 junio 12, 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.

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 junio 12, 2025.
EVA Air
8.4
Very good
1,202 reviews

Crew

8.6

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Boarding

8.4

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
1,202 reviews
EVA Air
8.4
Very good
1,202 reviews

Crew

8.6

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Boarding

8.4

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
1,302 reviews
EVA Air
8.4
Very good
1,202 reviews

Crew

8.6

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Boarding

8.4

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
Cathay Pacific
7.6
Good
892 reviews
EVA Air
8.4
Very good
1,202 reviews

Crew

8.6

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Boarding

8.4

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
3,584 reviews
EVA Air
8.4
Very good
1,202 reviews

Crew

8.6

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Boarding

8.4

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?

    Singapore Airlines, at $1,292, was found to be the cheapest airline from Seattle to Ko Samui.Alternate airlines to your destination round-trip include EVA Air and Qatar Airways. You may be able to fly from Seattle to Ko Samui for 3% 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$999Average$1,376FlexibilityNo cancel feeOn-time74%

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