CA $846 Cheap Flights from Seattle (SEA) to Samui Intl. Airport (USM)

View CA $846 flight on Wed, Apr 8, 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 (SEA) to Samui Intl. Airport (USM)

Prices were available within the past 7 days and start at CA $846 for one-way flights and CA $1,956 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

EVA Airways
Tue, Mar 31 - Wed, Apr 8
SEA
Seattle
USM
Koh Samui
CA $1,956 Roundtrip, found 6 days ago
CA $1,956
Roundtrip
found 6 days ago
Select EVA Airways flight, departing Tue, Mar 31 from Seattle to Koh Samui, returning Wed, Apr 8, priced at CA $1,956 found 6 days ago
EVA Airways
Tue, Mar 31 - Wed, Apr 8
SEA
Seattle
USM
Koh Samui
CA $2,127 Roundtrip, found 6 days ago
CA $2,127
Roundtrip
found 6 days ago
Select EVA Airways flight, departing Tue, Mar 31 from Seattle to Koh Samui, returning Wed, Apr 8, priced at CA $2,127 found 6 days ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,669 Roundtrip, found 22 hours ago
CA $2,669
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,669 found 22 hours ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,701 Roundtrip, found 22 hours ago
CA $2,701
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,701 found 22 hours ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,731 Roundtrip, found 22 hours ago
CA $2,731
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,731 found 22 hours ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,732 Roundtrip, found 22 hours ago
CA $2,732
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,732 found 22 hours ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,763 Roundtrip, found 22 hours ago
CA $2,763
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,763 found 22 hours ago
Emirates
Fri, Mar 20 - Fri, Mar 27
SEA
Seattle
USM
Koh Samui
CA $2,793 Roundtrip, found 22 hours ago
CA $2,793
Roundtrip
found 22 hours ago
Select Emirates flight, departing Fri, Mar 20 from Seattle to Koh Samui, returning Fri, Mar 27, priced at CA $2,793 found 22 hours ago
Cathay Pacific
Wed, Mar 18 - Mon, Mar 30
SEA
Seattle
USM
Koh Samui
CA $3,517 Roundtrip, found 22 hours ago
CA $3,517
Roundtrip
found 22 hours ago
Select Cathay Pacific flight, departing Wed, Mar 18 from Seattle to Koh Samui, returning Mon, Mar 30, priced at CA $3,517 found 22 hours ago
Singapore Airlines
Tue, Mar 31 - Wed, Apr 8
SEA
Seattle
USM
Koh Samui
CA $4,002 Roundtrip, found 6 days ago
CA $4,002
Roundtrip
found 6 days ago
Select Singapore Airlines flight, departing Tue, Mar 31 from Seattle to Koh Samui, returning Wed, Apr 8, priced at CA $4,002 found 6 days ago

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Frequently asked questions

How much is a flight from Sea-Tac Airport to USM?
Pack your bags, because round-trip journeys between Sea-Tac Airport and Ko Samui Airport start from CA $1,956. That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can rise quickly, so book today to lock in the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Sea-Tac Airport to USM?
Most flights can be cancelled online, but every air carrier has a different set of terms and conditions. If you do need to cancel your flight, go to our Customer Service Portal and follow the instructions.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport (USM) that have flexible change policies?
Select our "No change fees" filter to find flexible ticketing options for your flight from SEA to Ko Samui Airport. This allows you to lock in a low rate ahead of time and still have the freedom to make changes without any additional fees. You'll just need to pay the difference in fare.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to USM?
The distance is around 12,400 kilometres. Eye mask? Check. Noise-cancelling headphones? Double check. You'll need to pack all the essentials for this long-haul SeaTac to Koh Samui flight.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Ko Samui Airport?
Flying directly between Sea-Tac Airport and Ko Samui Airport isn't possible at present. However, you'll still be able to book a flight to Koh Samui with at least one stop.
Are Sea-Tac Airport to Ko Samui Airport flight tickets cheaper when they're purchased at the last minute?
Last-minute planners can sometimes pick up a bargain, with some super cheap airfares from SEA to Ko Samui Airport (USM) surfacing a few weeks prior to the departure date. If you'd rather plan ahead, Expedia compares and updates the best flight deals continuously — as early as 12 months in advance in some cases. It depends on the carrier though, as not all airlines release prices that far in advance.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Samui Intl. Airport
Airlines serving
Cathay Pacific, China Airlines, EVA Airways, KLM
Roundtrip price
CA $1,956
Distance
12353 km

Book with confidence

Seattle to Koh Samui Flights

The easy way to book your flights from Seattle to Samui Intl. Airport 

With Expedia, it’s simple to find and book flights to Samui Intl. Airport from Seattle whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Samui Intl. Airport, too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Seattle to Samui Intl. Airport today, tomorrow, or this week.  

 

Save dollars with cheap flights from Seattle - Tacoma Intl., SEA to Samui Intl. Airport, USM 

Sort your search results by price to find great deals on your flight from Seattle to Samui Intl. Airport—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Samui Intl. Airport from Seattle currently is just CA $1,956 rising to CA $4,002.  

Here are more money-saving tips: 

  • Fly in March when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Samui Intl. Airport  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Samui Intl. Airport from Seattle 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Samui Intl. Airport with Expedia today.

Seattle to Koh Samui Flights

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