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. Other layover 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 $927 round-trip on average, while Tuesday is the most expensive at $1,327, a difference of $400. 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 Fishermans Village. 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 0h 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 $750 to $6,007. That means the highest observed fare was about 8x 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.

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

Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around $14 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?

Round-trip flights from Seattle to Ko Samui range from $1,045 to $1,322, with an average of $1,171 over the past 12 months. Anything below $1,045 counts as a good deal.

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

Singapore Airlines ($750) offered the cheapest round-trip ticket from Seattle to Ko Samui in 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 $1,162. 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 1,342 minutes over the past 3 months.

$750 CHEAP FLIGHTS from Seattle to Ko Samui (SEA - USM)

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Cheapest round-trip

$750

Typical prices: $1,045-$1,322

Singapore Airlines

Fri 3/2Fri 3/9

SEA - USM • 1 stop

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

Recent round-trip flight deals from Seattle to Ko Samui

Tue, Mar 2 - Tue, Mar 9

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

$750Singapore Airlines

Wed, Nov 18 - Tue, Nov 24

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

41h 30m1 stop Singapore Changi

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

37h 10m1 stop Singapore Changi

$807Singapore Airlines

Tue, Mar 2 - Tue, Mar 9

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

$807Singapore Airlines

Wed, Nov 18 - Tue, Nov 24

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

41h 30m1 stop Singapore Changi

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

37h 10m1 stop Singapore Changi

$808Singapore Airlines

Wed, Dec 2 - Wed, Dec 9

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

32h 20m1 stop Singapore Changi

6:05 pm - 7:05 amUSM Ko Samui-SEA Seattle/Tacoma Intl

52h 00m1 stop Singapore Changi

$838Singapore Airlines

Tue, Mar 2 - Tue, Mar 9

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

29h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi

12:15 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

35h 30m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$957Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

10:03 am - 8:10 amSEA Seattle/Tacoma Intl-USM Ko Samui

31h 07m3 stops Vancouver Intl Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$968Multiple Airlines

Mon, Mar 1 - Tue, Mar 9

10:25 am - 7:45 amSEA Seattle/Tacoma Intl-USM Ko Samui

30h 20m2 stops Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$968Multiple Airlines

Tue, Mar 2 - Tue, Mar 9

10:25 am - 8:05 amSEA Seattle/Tacoma Intl-USM Ko Samui

30h 40m2 stops Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$968Multiple Airlines

Tue, Mar 2 - Tue, Mar 9

10:03 am - 10:35 amSEA Seattle/Tacoma Intl-USM Ko Samui

33h 32m3 stops Vancouver Intl Hong Kong Intl Bangkok Suvarnabhumi

9:30 pm - 8:45 amUSM Ko Samui-SEA Seattle/Tacoma Intl

26h 15m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$968Multiple 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.

Prices

Airlines

Layovers

How much is a round-trip flight from Seattle to Ko Samui?

Round-trip flights from Seattle to Ko Samui start at $750. Prices are below average for this route right now, with typical round-trip fares ranging from $1,045 to $1,322. The lowest price found in the past 5 days was $750 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, it 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

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	December
High season	March

Most popular time to fly with an average 13% increase in price.

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.

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. Other layover 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 $927 round-trip on average, while Tuesday is the most expensive at $1,327, a difference of $400. 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 Fishermans Village. 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 0h 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 $750 to $6,007. That means the highest observed fare was about 8x 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.
What car rental options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around $14 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?
Round-trip flights from Seattle to Ko Samui range from $1,045 to $1,322, with an average of $1,171 over the past 12 months. Anything below $1,045 counts as a good deal.

If your dates can be flexible, aim for a Thursday departure instead of Tuesday. On this route, Thursday flights average $927 - about $400 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 $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
- Amari Koh Samui
- Cosi Samui Chaweng Beach

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SEA - USM

$750 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

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

How much is a round-trip flight from Seattle to Ko Samui?

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

What is the cheapest airline 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

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