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.

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

Yes. Flexible dates can save you up to 22% on flights from Seattle to Ko Samui. Monday is the cheapest departure day at ฿35,284 return on average, while Tuesday is the most expensive at ฿44,805, a difference of ฿9,522. KAYAK's flexible dates feature shows options up to three 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 Bophut Beach. 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 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 ฿33,731 to ฿198,669. That means the highest observed fare was about 6x higher than the lowest one.

How are flight prices from Seattle to Ko Samui looking right now?

One-way fares from Seattle to Ko Samui are currently lower than usual. Average one-way flight prices are about ฿17,551, which is 28% below the typical average for this route.

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 rental companies, with daily rates starting from around ฿430 for economy cars. Top options include: • Drive Car Rental • Alamo • Sixt • Enterprise Rent-A-Car • Thai Rent

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

Return flights from Seattle to Ko Samui range from ฿36,004 to ฿44,651, with an average of ฿39,547 over the past 12 months. Anything below ฿36,004 counts as a good deal.

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

Based on deals KAYAK users found in the last 12 months, Monday is the cheapest day of the week to fly from Seattle to Ko Samui. It's 11% cheaper than the average day, while Tuesday is the most expensive, with prices 13% higher.

Which airline is the cheapest to fly from Seattle to Ko Samui?

Cathay Pacific (฿34,676) and Singapore Airlines (฿35,790) are the cheapest airlines to fly return from Seattle to Ko Samui according to KAYAK data over the last 5 days.

What is the cheapest stopover airport when flying from Seattle to Ko Samui?

Flights via Singapore Changi (SIN) offer the most affordable fares, with an average return price of ฿38,645. Based on KAYAK data over the past 3 months.

When flying from Seattle to Ko Samui, which airport offers the shortest stopover?

Singapore Changi (SIN) had the shortest average connection time for Seattle to Ko Samui stopovers at 22h 03m over the past 3 months.

฿16,443 CHEAP FLIGHTS from Seattle to Ko Samui (SEA - USM)

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Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Cheapest return flight

฿33,731

Typical prices: ฿36,004-฿44,651

Cathay Pacific

Mon 19/11Sun 2/12

SEA - USM • 2 stops

Cheapest one-way flight

฿16,443

Typical prices: ฿21,336-฿25,424

Multiple Airlines

Mon 26/11

SEA - USM • 2 stops

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

When to travel

November

Cheapest • 25% price drop

March

Most popular

Good to know

Start a new search

KAYAK searches hundreds of sites at once to find you the best travel deals.

We hope you enjoy your trip to Ko Samui!

Flight Deals

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

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

Return

One-way

Recent return flight deals from Seattle to Ko Samui

Thu 19 Nov - Wed 2 Dec

10:25 - 17:00SEA Seattle/Tacoma Intl-USM Ko Samui

39h 35m2 stops Hong Kong Intl Bangkok Suvarnabhumi

15:35 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

32h 10m2 stops Bangkok Suvarnabhumi Hong Kong Intl

฿33,731Multiple Airlines

2 days ago

Mon 1 Mar - Tue 9 Mar

10:25 - 07:10SEA Seattle/Tacoma Intl-USM Ko Samui

29h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi

19:10 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

52h 35m2 stops Bangkok Suvarnabhumi Hong Kong Intl

฿34,473Multiple Airlines

14 hours ago

Sat 3 Apr - Mon 12 Apr

22:59 - 19:40SEA Seattle/Tacoma Intl-USM Ko Samui

54h 41m2 stops Vancouver Intl Hong Kong Intl

11:55 - 10:05USM Ko Samui-SEA Seattle/Tacoma Intl

36h 10m1 stop Hong Kong Intl

฿34,676Cathay Pacific

20 hours ago

Thu 19 Nov - Wed 2 Dec

10:25 - 17:00SEA Seattle/Tacoma Intl-USM Ko Samui

39h 35m2 stops Hong Kong Intl Bangkok Suvarnabhumi

11:40 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

฿35,317Cathay Pacific

2 days ago

Wed 18 Nov - Tue 1 Dec

08:40 - 17:10SEA Seattle/Tacoma Intl-USM Ko Samui

41h 30m1 stop Singapore Changi

19:50 - 07:05USM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m1 stop Singapore Changi

฿35,790Singapore Airlines

2 days ago

Mon 1 Mar - Tue 9 Mar

10:03 - 07:10SEA Seattle/Tacoma Intl-USM Ko Samui

30h 07m3 stops Vancouver Intl Hong Kong Intl Bangkok Suvarnabhumi

21:30 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

฿35,824Multiple Airlines

1 day ago

Sat 3 Apr - Mon 12 Apr

22:59 - 19:40SEA Seattle/Tacoma Intl-USM Ko Samui

54h 41m2 stops Vancouver Intl Hong Kong Intl

11:55 - 07:12USM Ko Samui-SEA Seattle/Tacoma Intl

33h 17m2 stops Hong Kong Intl Vancouver Intl

฿35,891Cathay Pacific

20 hours ago

Sat 3 Apr - Mon 12 Apr

10:15 - 18:50SEA Seattle/Tacoma Intl-USM Ko Samui

42h 35m1 stop Singapore Changi

13:30 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

33h 15m1 stop Singapore Changi

฿35,959Multiple Airlines

20 hours ago

Mon 16 Nov - Wed 2 Dec

16:59 - 19:35SEA Seattle/Tacoma Intl-USM Ko Samui

35h 36m2 stops Los Angeles Hong Kong Intl

11:40 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

฿36,094Cathay Pacific

2 days ago

Mon 16 Nov - Fri 4 Dec

16:59 - 19:35SEA Seattle/Tacoma Intl-USM Ko Samui

35h 36m2 stops Los Angeles Hong Kong Intl

11:40 - 08:45USM Ko Samui-SEA Seattle/Tacoma Intl

36h 05m1 stop Hong Kong Intl

฿36,195Cathay Pacific

2 days ago

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 with more confidence.

Prices

Airlines

Stopovers

What's the cheapest day of the week to fly from Seattle to Ko Samui?: Based on deals KAYAK users found in the last 12 months, Monday is the cheapest day of the week to fly from Seattle to Ko Samui. It's 11% cheaper than the average day, while Tuesday is the most expensive, with prices 13% higher.

Find deals

Low season	September
High season	March
Cheapest flight	฿16,443

Beat the crowds with an average 76% drop in travellers.

The most popular month to fly with an average 104% increase in travellers.

One-way flight from Seattle to Ko Samui

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

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

How long is a flight from Seattle to Ko Samui?
A direct flight from Seattle to Ko Samui takes 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.
How much should I expect to pay for a Seattle to Ko Samui flight?
Return flights from Seattle to Ko Samui range from ฿36,004 to ฿44,651, with an average of ฿39,547 over the past 12 months. Anything below ฿36,004 counts as a good deal.
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 ฿33,731 to ฿198,669. That means the highest observed fare was about 6x higher than the lowest one.
How are flight prices from Seattle to Ko Samui looking right now?
One-way fares from Seattle to Ko Samui are currently lower than usual. Average one-way flight prices are about ฿17,551, which is 28% below the typical average for this route.
Which car hire options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around ฿430 for economy cars. Top options include:

• Drive Car Rental
• Alamo
• Sixt
• Enterprise Rent-A-Car
• Thai Rent
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.
Can I save money by using flexible dates for flights from Seattle to Ko Samui?
Yes. Flexible dates can save you up to 22% on flights from Seattle to Ko Samui. Monday is the cheapest departure day at ฿35,284 return on average, while Tuesday is the most expensive at ฿44,805, a difference of ฿9,522.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.
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.
What popular places can I visit in Ko Samui?
Some of the most popular sights in Ko Samui are Chaweng Beach, Lamai Beach, and Bophut Beach. These are among the most viewed places in Ko Samui on KAYAK.

If your dates are flexible, aim for a Monday departure and avoid flying on Tuesday. On this route, Monday flights average ฿35,284, which is about ฿9,522 less than Tuesday fares (21% 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 ฿29,746 return in that month – typically ฿26,910 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
• Melia Koh Samui
• Royal Muang Samui Villas

More options for your flight from Seattle to Ko Samui

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Car rentals in Ko Samui

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SEA - USM

฿16,443 Find Cheap Flights from Seattle to Ko Samui – Compare and Save

Everything you should know

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

Recent return flight deals from Seattle to Ko Samui

Recent one-way flight deals from Seattle to Ko Samui

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

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

Which airline is the cheapest to fly from Seattle to Ko Samui?

What is the cheapest stopover airport when flying from Seattle to Ko Samui?

When flying from Seattle to Ko Samui, which airport offers the shortest stopover?

Key details for Seattle to Ko Samui flights

Low season

High season

Cheapest flight

When to book flights from Seattle to Ko Samui

Your Seattle to Ko Samui flight questions, answered

Your guide to booking Seattle to Ko Samui flights

More options for your flight from Seattle to Ko Samui

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

Information on your arrival and departure airports

Cabin class types available on flights from Seattle to Ko Samui

Flights from domestic origins to Ko Samui

Flights to other popular destinations