$537 Cheap Flights from Samui Intl. Airport (USM) to Seattle (SEA)

View $537 flight on Mon, Oct 27, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $537 for one-way flights and $980 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

EVA Airways
Wed, May 13 - Thu, May 21
USM
Koh Samui
SEA
Seattle
$980 Roundtrip, found 3 days ago
$980
Roundtrip
found 3 days ago
Select EVA Airways flight, departing Wed, May 13 from Koh Samui to Seattle, returning Thu, May 21, priced at $980 found 3 days ago
EVA Airways
Sat, Nov 8 - Sat, Nov 29
USM
Koh Samui
SEA
Seattle
$982 Roundtrip, found 12 hours ago
$982
Roundtrip
found 12 hours ago
Select EVA Airways flight, departing Sat, Nov 8 from Koh Samui to Seattle, returning Sat, Nov 29, priced at $982 found 12 hours ago
EVA Airways
Sat, Nov 8 - Tue, Nov 25
USM
Koh Samui
SEA
Seattle
$1,002 Roundtrip, found 12 hours ago
$1,002
Roundtrip
found 12 hours ago
Select EVA Airways flight, departing Sat, Nov 8 from Koh Samui to Seattle, returning Tue, Nov 25, priced at $1,002 found 12 hours ago
EVA Airways
Sat, Dec 13 - Tue, Dec 30
USM
Koh Samui
SEA
Seattle
$1,042 Roundtrip, found 12 hours ago
$1,042
Roundtrip
found 12 hours ago
Select EVA Airways flight, departing Sat, Dec 13 from Koh Samui to Seattle, returning Tue, Dec 30, priced at $1,042 found 12 hours ago
EVA Airways
Mon, Dec 22 - Fri, Jan 9
USM
Koh Samui
SEA
Seattle
$1,061 Roundtrip, found 2 days ago
$1,061
Roundtrip
found 2 days ago
Select EVA Airways flight, departing Mon, Dec 22 from Koh Samui to Seattle, returning Fri, Jan 9, priced at $1,061 found 2 days ago
EVA Airways
Tue, Jan 27 - Tue, Feb 10
USM
Koh Samui
SEA
Seattle
$1,066 Roundtrip, found 2 days ago
$1,066
Roundtrip
found 2 days ago
Select EVA Airways flight, departing Tue, Jan 27 from Koh Samui to Seattle, returning Tue, Feb 10, priced at $1,066 found 2 days ago
Bangkok Airways
Tue, Jan 20 - Mon, Feb 9
USM
Koh Samui
SEA
Seattle
$1,173 Roundtrip, found 2 days ago
$1,173
Roundtrip
found 2 days ago
Select Bangkok Airways flight, departing Tue, Jan 20 from Koh Samui to Seattle, returning Mon, Feb 9, priced at $1,173 found 2 days ago
China Airlines
Sat, Jan 24 - Mon, Feb 9
USM
Koh Samui
SEA
Seattle
$1,201 Roundtrip, found 2 days ago
$1,201
Roundtrip
found 2 days ago
Select China Airlines flight, departing Sat, Jan 24 from Koh Samui to Seattle, returning Mon, Feb 9, priced at $1,201 found 2 days ago
Singapore Airlines
Wed, May 13 - Thu, May 21
USM
Koh Samui
SEA
Seattle
$1,229 Roundtrip, found 3 days ago
$1,229
Roundtrip
found 3 days ago
Select Singapore Airlines flight, departing Wed, May 13 from Koh Samui to Seattle, returning Thu, May 21, priced at $1,229 found 3 days ago
Lufthansa
Tue, Jan 13 - Thu, Jan 29
USM
Koh Samui
SEA
Seattle
$1,234 Roundtrip, found 2 days ago
$1,234
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Tue, Jan 13 from Koh Samui to Seattle, returning Thu, Jan 29, priced at $1,234 found 2 days ago

Frequently asked questions

How much does a flight from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight from $537 or cheap return flight from $980 from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA)?
Planning your trip for May is a good way to save, as it's the cheapest month for flights between USM and SEA. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from USM to SEA, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA)?
There aren't any daily nonstop flights available from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from USM to SEA?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on a range of factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA) route, fly before 3 PM. Flights after this time have a 22% higher chance of being canceled.**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 Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until right before your break to book a ticket from USM to SEA often results in higher prices. While you may find some last-minute offers, they're not always guaranteed. Be flexible with your travel plans for a better chance of getting a bargain.
Is it cheaper to book an USM to SEA flight and hotel package?
Securing an USM to SEA flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Pick from our wide range of hotels and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ko Samui Airport (USM) to Seattle - Tacoma Intl. Airport (SEA)?
Typically, you can cancel or modify your USM to SEA flight. However, additional charges may apply, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you want more information, visit our Customer Service portal.

Travel information

Origin airport
Samui Intl. Airport
Destination airport
Seattle - Tacoma Intl.
Roundtrip price
$980
Distance
7720 mi

Book with confidence

Samui Intl. Airport to Seattle Flights

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

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 Samui Intl. Airport to Seattle are during the month of May. You can find some of the cheapest flights from Samui Intl. Airport to Seattle with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Samui Intl. Airport to Seattle: 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 Samui Intl. Airport to Seattle

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 Samui Intl. Airport to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $537 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 Samui Intl. Airport to Seattle 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 Samui Intl. Airport to Seattle 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.

 

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