$460 Cheap Flights from Seattle (SEA) to Samui Intl. Airport (USM)

View $460 flight on Thu, Jan 22, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $460 for one-way flights and $882 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Singapore Airlines
Thu, Dec 4 - Thu, Dec 11
SEA
Seattle
USM
Koh Samui
$882 Roundtrip, found 16 hours ago
$882
Roundtrip
found 16 hours ago
Select Singapore Airlines flight, departing Thu, Dec 4 from Seattle to Koh Samui, returning Thu, Dec 11, priced at $882 found 16 hours ago
Singapore Airlines
Fri, May 1 - Mon, May 11
SEA
Seattle
USM
Koh Samui
$887 Roundtrip, found 3 days ago
$887
Roundtrip
found 3 days ago
Select Singapore Airlines flight, departing Fri, May 1 from Seattle to Koh Samui, returning Mon, May 11, priced at $887 found 3 days ago
STARLUX Airlines
Tue, Nov 4 - Sat, Nov 8
SEA
Seattle
USM
Koh Samui
$917 Roundtrip, found 20 hours ago
$917
Roundtrip
found 20 hours ago
Select STARLUX Airlines flight, departing Tue, Nov 4 from Seattle to Koh Samui, returning Sat, Nov 8, priced at $917 found 20 hours ago
Singapore Airlines
Thu, Dec 4 - Thu, Dec 11
SEA
Seattle
USM
Koh Samui
$925 Roundtrip, found 16 hours ago
$925
Roundtrip
found 16 hours ago
Select Singapore Airlines flight, departing Thu, Dec 4 from Seattle to Koh Samui, returning Thu, Dec 11, priced at $925 found 16 hours ago
Singapore Airlines
Thu, Apr 16 - Sat, May 2
SEA
Seattle
USM
Koh Samui
$929 Roundtrip, found 6 days ago
$929
Roundtrip
found 6 days ago
Select Singapore Airlines flight, departing Thu, Apr 16 from Seattle to Koh Samui, returning Sat, May 2, priced at $929 found 6 days ago
Singapore Airlines
Sat, Feb 21 - Fri, Mar 6
SEA
Seattle
USM
Koh Samui
$932 Roundtrip, found 14 hours ago
$932
Roundtrip
found 14 hours ago
Select Singapore Airlines flight, departing Sat, Feb 21 from Seattle to Koh Samui, returning Fri, Mar 6, priced at $932 found 14 hours ago
Japan Airlines
Thu, Jan 22 - Sun, Feb 1
SEA
Seattle
USM
Koh Samui
$940 Roundtrip, found 5 days ago
$940
Roundtrip
found 5 days ago
Select Japan Airlines flight, departing Thu, Jan 22 from Seattle to Koh Samui, returning Sun, Feb 1, priced at $940 found 5 days ago
STARLUX Airlines
Sun, Mar 29 - Sun, Apr 19
SEA
Seattle
USM
Koh Samui
$942 Roundtrip, found 1 day ago
$942
Roundtrip
found 1 day ago
Select STARLUX Airlines flight, departing Sun, Mar 29 from Seattle to Koh Samui, returning Sun, Apr 19, priced at $942 found 1 day ago
EVA Airways
Mon, Apr 20 - Thu, May 7
SEA
Seattle
USM
Koh Samui
$1,033 Roundtrip, found 1 day ago
$1,033
Roundtrip
found 1 day ago
Select EVA Airways flight, departing Mon, Apr 20 from Seattle to Koh Samui, returning Thu, May 7, priced at $1,033 found 1 day ago
China Airlines
Mon, Jan 12 - Mon, Jan 26
SEA
Seattle
USM
Koh Samui
$1,140 Roundtrip, found 10 hours ago
$1,140
Roundtrip
found 10 hours ago
Select China Airlines flight, departing Mon, Jan 12 from Seattle to Koh Samui, returning Mon, Jan 26, priced at $1,140 found 10 hours 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 $1,103
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $1,103

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 $460 or cheap return flight from $882 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 December, 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

Origin airport
Seattle - Tacoma Intl.
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific, China Airlines, EVA Airways, KLM, Lufthansa, Qatar Airways, Singapore Airlines, Turkish Airlines
Roundtrip price
$881
Distance
7720 mi

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 December. 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 $460 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.