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).

What cabin classes can I book on flights from Seattle to Ko Samui?

Only Economy Class is available on flights from Seattle to Ko Samui.

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 $1,045 round-trip on average, while Tuesday is the most expensive at $1,327, a difference of $282. 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 Lamai Beach, Chaweng Beach and Choeng Mon Beach. These are among the most viewed places in Ko Samui on KAYAK.

How long is a flight from Seattle to Ko Samui?

A nonstop flight from Seattle to Ko Samui takes 00m, covering 7,715 miles.

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, round-trip prices on this route showed a wide range, from about $958 to $5,876. 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 $519, 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.

What car rental options are available at Ko Samui Airport (USM)?

Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates averaging $29 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?

Round-trip flights from Seattle to Ko Samui range from $1,066 to $1,322, with an average of $1,171 over the past 12 months. Anything below $1,066 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?

Singapore Airlines ($959) and Cathay Pacific ($1,027) are the cheapest airlines to fly round-trip from Seattle to Ko Samui according to KAYAK data over the last 5 days.

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

Flights via Singapore Changi (SIN) offer the most affordable fares, with an average round-trip price of $1,145. Based on KAYAK data over the past 3 months.

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

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

$487 CHEAP FLIGHTS from Seattle to Ko Samui (SEA - USM)

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Cheapest round-trip

$958

Typical prices: $1,066-$1,322

Multiple Airlines

Sun 1/28Fri 2/16

SEA - USM • 2 stops

Cheapest one-way

$487

Typical prices: $632-$753

Multiple Airlines

Mon 11/26

SEA - USM • 2 stops

Nonstop 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

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We hope you love 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.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Seattle to Ko Samui

Thu, Jan 28 - Tue, Feb 16

10:25 am - 6:55 amSEA Seattle/Tacoma Intl-USM Ko Samui

53h 30m2 stops Hong Kong Intl Bangkok Suvarnabhumi

2:05 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

33h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$958Multiple Airlines

Tue, Feb 9 - Sun, Feb 28

8:40 am - 6:55 pmSEA Seattle/Tacoma Intl-USM Ko Samui

43h 15m1 stop Singapore Changi

8:55 am - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

61h 10m1 stop Singapore Changi

$959Singapore Airlines

Tue, Feb 9 - Sun, Feb 28

10:25 am - 6:55 amSEA Seattle/Tacoma Intl-USM Ko Samui

29h 30m2 stops Hong Kong Intl Bangkok Suvarnabhumi

4:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

31h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$990Multiple Airlines

Thu, Nov 19 - Wed, Dec 2

10:25 am - 5:00 pmSEA Seattle/Tacoma Intl-USM Ko Samui

39h 35m2 stops Hong Kong Intl Bangkok Suvarnabhumi

3:35 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

32h 10m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$999Multiple Airlines

Thu, Jan 21 - Wed, Jan 27

10:25 am - 6:55 amSEA Seattle/Tacoma Intl-USM Ko Samui

53h 30m2 stops Hong Kong Intl Bangkok Suvarnabhumi

4:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

31h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$1,005Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

10:25 am - 7:10 amSEA Seattle/Tacoma Intl-USM Ko Samui

29h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi

7:10 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

52h 35m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$1,021Multiple Airlines

Sat, Apr 3 - Mon, Apr 12

10:59 pm - 7:40 pmSEA Seattle/Tacoma Intl-USM Ko Samui

54h 41m2 stops Vancouver Intl Hong Kong Intl

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

36h 10m1 stop Hong Kong Intl

$1,027Cathay Pacific

Wed, Nov 18 - Tue, Dec 1

8:40 am - 5:10 pmSEA Seattle/Tacoma Intl-USM Ko Samui

41h 30m1 stop Singapore Changi

7:50 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m1 stop Singapore Changi

$1,060Singapore Airlines

Tue, Nov 17 - Tue, Dec 1

8:40 am - 5:10 pmSEA Seattle/Tacoma Intl-USM Ko Samui

41h 30m1 stop Singapore Changi

12:00 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

34h 05m1 stop Singapore Changi

$1,082Singapore Airlines

Tue, Jan 26 - Tue, Feb 16

8:40 am - 8:00 amSEA Seattle/Tacoma Intl-USM Ko Samui

32h 20m1 stop Singapore Changi

8:55 am - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

37h 10m1 stop Singapore Changi

$1,098Singapore 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 with more confidence.

Prices

Airlines

Layovers

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

Expert advice

Our travel experts

Harriet Baskas

Expert on Alaska Airlines and JetBlue

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Stefanie Waldek

Expert on Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Low season	September
High season	March
Cheapest flight	$487

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

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

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 round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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.

What cabin classes can I book on flights from Seattle to Ko Samui?
Only Economy Class is available on flights from Seattle to Ko Samui.
How long is a flight from Seattle to Ko Samui?
A nonstop flight from Seattle to Ko Samui takes 00m, covering 7,715 miles.
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?
Round-trip flights from Seattle to Ko Samui range from $1,066 to $1,322, with an average of $1,171 over the past 12 months. Anything below $1,066 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, round-trip prices on this route showed a wide range, from about $958 to $5,876. 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 $519, which is 28% below the typical average for this route.
What car rental options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates averaging $29 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 $1,045 round-trip on average, while Tuesday is the most expensive at $1,327, a difference of $282.

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 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 Lamai Beach, Chaweng Beach and Choeng Mon 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 $1,045, about $282 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 $881 round-trip in that month - typically $797 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
• Amari Koh Samui

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SEA - USM

$487 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 round-trip flight deals from Seattle to Ko Samui

Recent one-way flight deals from Seattle to Ko Samui

Recent last minute 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 layover airport when flying from Seattle to Ko Samui?

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

Expert advice for your flight from Seattle to Ko Samui

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 rental

Information on your arrival and departure airports

Cabin class types available on flights from Seattle to Ko Samui

Find direct flights to and from Seattle and Ko Samui

Flights from domestic origins to Ko Samui

Flights to other popular destinations