SEA - USM

฿24,710 Find Cheap Flights from Seattle to Ko Samui – Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest return flight
฿24,710
Typical prices: ฿34,430-฿43,570
Singapore Airlines
Fri 2/3Fri 9/3
SEA - USM • 1 stop
Direct flights
Not available
There are currently no direct flights between Seattle and Ko Samui. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
November
Cheapest • 25% price drop
March
Most popular
Good to know
+1
Good to know
+1
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We hope you enjoy your trip to Ko Samui!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Ko Samui (SEA-USM)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Seattle to Ko Samui

Tue 2 Mar - Tue 9 Mar
Singapore Airlines Logo
08:40 - 08:00SEA  Seattle/Tacoma Intl-USM Ko Samui
32h 20m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:05USM  Ko Samui-SEA Seattle/Tacoma Intl
37h 10m1 stop Singapore Changi
฿24,710Singapore Airlines
Wed 18 Nov - Tue 24 Nov
Singapore Airlines Logo
08:40 - 17:10SEA  Seattle/Tacoma Intl-USM Ko Samui
41h 30m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:05USM  Ko Samui-SEA Seattle/Tacoma Intl
37h 10m1 stop Singapore Changi
฿26,621Singapore Airlines
Wed 2 Dec - Wed 9 Dec
Singapore Airlines Logo
08:40 - 08:00SEA  Seattle/Tacoma Intl-USM Ko Samui
32h 20m1 stop Singapore Changi
Singapore Airlines Logo
18:05 - 07:05USM  Ko Samui-SEA Seattle/Tacoma Intl
52h 00m1 stop Singapore Changi
฿27,610Singapore Airlines
Tue 2 Mar - Tue 9 Mar
Singapore Airlines Logo
08:40 - 17:10SEA  Seattle/Tacoma Intl-USM Ko Samui
41h 30m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:05USM  Ko Samui-SEA Seattle/Tacoma Intl
37h 10m1 stop Singapore Changi
฿27,906Singapore Airlines
Wed 28 Oct - Sun 1 Nov
Multiple Airlines Logo
11:25 - 07:10SEA  Seattle/Tacoma Intl-USM Ko Samui
29h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
07:55 - 09:45USM  Ko Samui-SEA Seattle/Tacoma Intl
39h 50m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿31,530Multiple Airlines
Sun 8 Nov - Sun 15 Nov
Singapore Airlines Logo
08:40 - 17:10SEA  Seattle/Tacoma Intl-USM Ko Samui
41h 30m1 stop Singapore Changi
Singapore Airlines Logo
12:00 - 07:05USM  Ko Samui-SEA Seattle/Tacoma Intl
58h 05m1 stop Singapore Changi
฿31,827Singapore Airlines
Mon 1 Mar - Tue 9 Mar
Multiple Airlines Logo
10:25 - 07:35SEA  Seattle/Tacoma Intl-USM Ko Samui
30h 10m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
21:30 - 08:45USM  Ko Samui-SEA Seattle/Tacoma Intl
26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿31,893Multiple Airlines
Sat 17 Oct - Sat 24 Oct
Multiple Airlines Logo
15:20 - 19:40SEA  Seattle/Tacoma Intl-USM Ko Samui
38h 20m2 stops Los Angeles Hong Kong Intl
Multiple Airlines Logo
11:55 - 08:56USM  Ko Samui-SEA Seattle/Tacoma Intl
35h 01m2 stops Hong Kong Intl Los Angeles
฿31,992Multiple Airlines
Tue 2 Mar - Tue 9 Mar
Multiple Airlines Logo
10:25 - 07:10SEA  Seattle/Tacoma Intl-USM Ko Samui
29h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
21:30 - 08:45USM  Ko Samui-SEA Seattle/Tacoma Intl
26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿32,090Multiple Airlines
Wed 18 Nov - Tue 24 Nov
Multiple Airlines Logo
10:25 - 11:30SEA  Seattle/Tacoma Intl-USM Ko Samui
34h 05m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
21:30 - 08:45USM  Ko Samui-SEA Seattle/Tacoma Intl
26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿32,618Multiple Airlines
Booking Insights

Price, demand, and travel trends for Seattle to Ko Samui flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Seattle to Ko Samui with more confidence.

How much is a return flight from Seattle to Ko Samui?

Return flights from Seattle to Ko Samui start at ฿24,710. Prices are below average for this route right now, with typical return fares ranging from ฿34,430 to ฿43,570. The lowest price found in the past 5 days was ฿24,710 on Singapore Airlines.

What's the cheapest day of the week to fly from Seattle to Ko Samui?

Thursday is the cheapest day of the week to fly from Seattle to Ko Samui and is 21% cheaper than the average day. Tuesday is the most expensive day with flight prices 13% higher than average. Based on deals found by KAYAK users in the last 12 months.

Find deals

Key details for Seattle to Ko Samui flights

Low season

December
Most popular time to fly (13% more expensive on average)

When to book flights from Seattle to Ko Samui

Are your dates flexible? Find out the best times to travel from Seattle to Ko Samui based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Your Seattle to Ko Samui flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • Which airports can I use when flying from Seattle to Ko Samui?

    Flights from Seattle to Ko Samui usually depart from Seattle/Tacoma Intl (SEA) and arrive at Ko Samui (USM).

  • Which airports do connecting flights from Seattle to Ko Samui pass through?

    Most connecting flights from Seattle to Ko Samui pass through Singapore Changi (SIN), which handles 100% of one-stop traffic on this route. Other stopover airports each see under 5%.

  • Can I save money by using flexible dates for flights from Seattle to Ko Samui?

    Yes. Being flexible with your travel dates can save you up to 31% on the Seattle to Ko Samui route. Thursday is the cheapest departure day at ฿30,542 return on average, while Tuesday is the most expensive at ฿43,721, a difference of ฿13,179. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in Ko Samui?

    Some of the most popular sights in Ko Samui are Chaweng Beach, Lamai Beach, and Hin Ta and Hin Yai Rocks. These are among the most viewed places in Ko Samui on KAYAK.

  • How long is a flight from Seattle to Ko Samui?

    A direct flight from Seattle to Ko Samui takes 0h 00m, covering 19,983 km.

  • Do I need a passport to fly from Seattle to Ko Samui?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • Have flight prices from Seattle to Ko Samui changed much recently?

    Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about ฿24,710 to ฿181,269. That means the highest observed fare was about 7x higher than the lowest one.

  • What is the time difference between Seattle and Ko Samui?

    Ko Samui is 14 hours ahead of Seattle (Indochina Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • Which car hire options are available at Ko Samui Airport (USM)?

    Ko Samui Airport (USM) hosts 5 major car hire companies, with daily rates starting from around ฿447 for economy cars. Top options include:
    • Drive Car Rental
    • Alamo
    • Sixt
    • Enterprise Rent-A-Car
    • Hertz

  • How much should I expect to pay for a Seattle to Ko Samui flight?

    Return flights from Seattle to Ko Samui range from ฿34,430 to ฿43,570, with an average of ฿38,590 over the past 12 months. Anything below ฿34,430 counts as a good deal.

Your guide to booking Seattle to Ko Samui flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure instead of Tuesday. On this route, Thursday flights average ฿30,542 – about ฿13,179 less than Tuesday (30% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Seattle to Ko Samui trip for November. Fares historically average ฿29,026 return in that month – typically ฿26,259 less than the most expensive month, which is July (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ko Samui Airport.
    - Ozo Chaweng Samui - Sha Extra Plus
    - Cosi Samui Chaweng Beach
    - Melia Koh Samui

More options for your flight from Seattle to Ko Samui

Complete your trip to Ko Samui with a hotel stay or car hire

Car rentals in Ko Samui
Hotels in Ko Samui