$471 Cheap Flights from Seattle (SEA) to Samui Intl. Airport (USM)

View $471 flight on Thu, Jan 22, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Samui Intl. Airport (USM)

Cheap Flights from Seattle to Samui Intl. Airport (SEA-USM)

Prices were available within the past 7 days and start at $471 for one-way flights and $805 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Singapore Airlines
Sun, Nov 9 - Wed, Nov 12
SEA
Seattle
USM
Koh Samui
$805 Roundtrip, found 4 days ago
$805
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Sun, Nov 9 from Seattle to Koh Samui, returning Wed, Nov 12, priced at $805 found 4 days ago
Singapore Airlines
Sun, Nov 9 - Wed, Nov 12
SEA
Seattle
USM
Koh Samui
$844 Roundtrip, found 4 days ago
$844
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Sun, Nov 9 from Seattle to Koh Samui, returning Wed, Nov 12, priced at $844 found 4 days ago
Singapore Airlines
Sun, Nov 9 - Wed, Nov 12
SEA
Seattle
USM
Koh Samui
$882 Roundtrip, found 4 days ago
$882
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Sun, Nov 9 from Seattle to Koh Samui, returning Wed, Nov 12, priced at $882 found 4 days ago
Singapore Airlines
Sat, Feb 28 - Mon, Mar 9
SEA
Seattle
USM
Koh Samui
$887 Roundtrip, found 5 days ago
$887
Roundtrip
found 5 days ago
Select Singapore Airlines flight, departing Sat, Feb 28 from Seattle to Koh Samui, returning Mon, Mar 9, priced at $887 found 5 days ago
Singapore Airlines
Sun, Nov 9 - Wed, Nov 12
SEA
Seattle
USM
Koh Samui
$896 Roundtrip, found 4 days ago
$896
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Sun, Nov 9 from Seattle to Koh Samui, returning Wed, Nov 12, priced at $896 found 4 days ago
Singapore Airlines
Tue, Nov 25 - Wed, Dec 10
SEA
Seattle
USM
Koh Samui
$924 Roundtrip, found 6 days ago
$924
Roundtrip
found 6 days ago
Select Singapore Airlines flight, departing Tue, Nov 25 from Seattle to Koh Samui, returning Wed, Dec 10, priced at $924 found 6 days ago
EVA Airways
Thu, Jan 22 - Tue, Jan 27
SEA
Seattle
USM
Koh Samui
$1,033 Roundtrip, found 4 hours ago
$1,033
Roundtrip
found 4 hours ago
Select EVA Airways flight, departing Thu, Jan 22 from Seattle to Koh Samui, returning Tue, Jan 27, priced at $1,033 found 4 hours ago
STARLUX Airlines
Sat, Mar 28 - Mon, Apr 6
SEA
Seattle
USM
Koh Samui
$1,038 Roundtrip, found 1 day ago
$1,038
Roundtrip
found 1 day ago
Select STARLUX Airlines flight, departing Sat, Mar 28 from Seattle to Koh Samui, returning Mon, Apr 6, priced at $1,038 found 1 day ago
China Airlines
Wed, Jan 7 - Mon, Jan 19
SEA
Seattle
USM
Koh Samui
$1,197 Roundtrip, found 13 hours ago
$1,197
Roundtrip
found 13 hours ago
Select China Airlines flight, departing Wed, Jan 7 from Seattle to Koh Samui, returning Mon, Jan 19, priced at $1,197 found 13 hours ago
Cathay Pacific
Sat, Oct 11 - Thu, Oct 16
SEA
Seattle
USM
Koh Samui
$1,306 Roundtrip, found 4 days ago
$1,306
Roundtrip
found 4 days ago
Select Cathay Pacific flight, departing Sat, Oct 11 from Seattle to Koh Samui, returning Thu, Oct 16, priced at $1,306 found 4 days ago

Alternative airports near Koh Samui

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Samui Intl. Airport USM. Cheapest and Closest option available. Average driving time to city center is 31 minutes. Flights from $1,312
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $1,312

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM) cost?
Grab a cheap one-way flight from $471 or cheap return flight from $805 from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM)?
The cheapest month to fly from SEA to USM is November, when demand is low. Off-peak months are usually when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest SEA to USM flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM)?
You'll need to hop on a flight with a layover if you're traveling from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from SEA to USM?
Typically you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can change based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM)?
To reach Ko Samui Airport (USM) on time, opt for a flight that leaves Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM) last-minute?
Holding off until just before your departure to book a flight from SEA to USM often results in higher prices. While you may come across some last-minute offers, there's no guarantee. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a SEA to USM flight and hotel package?
Booking a SEA to USM flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Pick from our impressive range of accommodations and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM)?
If you booked your SEA to USM flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you want more information.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Samui Intl. Airport
Airlines serving
Air France, British Airways, Cathay Pacific, China Airlines, EVA Airways, KLM, Lufthansa, Qatar Airways, Singapore Airlines, Turkish Airlines
Roundtrip price
$805
Distance
7720 mi

Book with confidence

Book with confidence

Seattle to Samui Intl. Airport Flights

The cheapest times to fly from Seattle to Samui Intl. Airport

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Samui Intl. Airport are during the month of November. You can find some of the cheapest flights from Seattle to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Samui Intl. Airport

Sunday is one of the best days to book for cheap flights from Seattle to Samui Intl. Airport: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Samui Intl. Airport

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $471 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Samui Intl. Airport flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Samui Intl. Airport airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seattle to Samui Intl. Airport Flights
*Available to One Key members.