C$794 Cheap Flights from Seattle / Tacoma International (SEA) to Samui International (USM)

Compare Seattle / Tacoma International to Samui International flight deals

Find the cheapest month or even day of the year to fly to Samui International

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Flight deals from Seattle / Tacoma International to Samui International

Looking for a cheap last-minute deal or the best return flight from Seattle / Tacoma International Airport to Samui International Airport? If you want to travel next month, return fares start from C$1,951. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle / Tacoma International to Samui International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle / Tacoma International to Samui International flights are currently cheapest in August.

Seattle / Tacoma International to Samui International: Alternative routes

Compare routes from Seattle / Tacoma International to Koh Samui below. You may find an airport to fly into that's cheaper, faster, or easier than Samui International.

Seattle to Koh Samui: Flight information

The things to know before you go.
Cheapest flight foundC$794
Cheapest month to flyAugust

Finding cheap flights from Seattle / Tacoma International to Samui International: Frequently asked questions

The best price we found for a return flight from Seattle / Tacoma International to Samui International is C$1,390. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Seattle / Tacoma International to Samui International. But we found flights with one or more stops from C$1,390.
As of May 2026, there are no flights flying from Seattle / Tacoma International to Samui International.
The cheapest month to fly from Seattle / Tacoma International to Samui International is usually November.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Seattle / Tacoma International Airport to Samui International Airport on Wednesday, November 25, 2026.
No airlines currently offer direct flights between Seattle / Tacoma International Airport and Samui International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Samui International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Koh Samui is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Singapore Airlines offers the cheapest flight tickets to Samui International.

Flying from Seattle-Tacoma International Airport (SEA) to Koh Samui Airport (USM): what you need to know

  • During popular months like July, it's best to get to the airport earlier than usual. Plan to arrive two hours before a domestic departure and four hours ahead of international flights when you fly during a peak period in general.

  • Opt for a stopover if you prefer to break up your flight from Seattle-Tacoma International Airport to Koh Samui Airport. To look at all your options, just deselect 'Direct flights only.' Changi International Airport is a popular stopover on the SEA to USM route.

How to find the cheapest flights from Seattle-Tacoma International Airport (SEA) to Koh Samui Airport (USM)

  • The lowest price we've seen for a one-way ticket from Seattle-Tacoma International Airport to Koh Samui Airport is C$794. For a return flight on this route, the best price is C$1,390. Depending on the availability when you book, these fares could change.

  • To find cheap flight tickets from SEA to USM, book as early as you can. Airlines tend to offer lower fares when flights are first made available.

  • If you can be flexible with your travel plans, try using the 'Whole month' search function. It'll give you the lowest price across every month when looking for your ticket from Seattle-Tacoma International Airport to Koh Samui Airport.

  • Finding a cheap ticket from SEA to USM is a piece of cake with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as the price has dropped.

  • Tailor your trip using filters. Select your ideal arrival and departure times, total journey duration and airlines. You can also sort results by 'Best,' 'Fastest' or 'Cheapest' flights from Seattle-Tacoma International Airport to Koh Samui Airport.

Handy information about Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport is about 23 kilometres from central Seattle. If you're ride-sharing, catching a cab or driving from the center, it'll take 18 minutes or so to get there, depending on traffic. If you're taking public transport, expect the trip time to be around 54 minutes.

  • Want a handy hotel close to SEA? If you're on an early flight from Seattle-Tacoma International Airport to Koh Samui Airport, these stays will have you moments from check-in:

Arriving at Koh Samui Airport (USM)

  • If you're on a late flight from Seattle-Tacoma International Airport to Koh Samui Airport, few things top the convenience of staying close to the terminal. Grab your bags from the carousel and then be showered and sleeping soon after at one of these hotels near USM:

Getting from Koh Samui Airport (USM) to central Thailand

  • Koh Samui Airport to central Thailand is roughly 611 kilometres. If you're taking a cab or renting a car, do a little research to make your trip as easy as possible. Journey times may change based on traffic and the time of day.

When to fly to Koh Samui Airport (USM)

  • The quietest month for a flight from Seattle-Tacoma International Airport to Koh Samui Airport is February, while August is the most popular. Pick the best time to go to Thailand based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • Book your flight from Seattle-Tacoma International Airport to Koh Samui Airport for April if you'd like to visit Thailand during its warmest month. Expect temperatures of between 24ºC and 41ºC.

  • December sees average temperatures of between 16ºC and 32ºC. Search for cheap flight tickets from SEA to USM sometime around then if you want to travel in cooler conditions.

More about Thailand

  • As soon as you've booked your flight from SEA to USM, snapping up a great stay in Thailand will be top of your list. Phutawan Resort is a top option.

  • There are so many things to see and do in this city it can be hard to figure out where to begin. Wat Pu Muang, Wat Ma Muang Ched Ton and Wat Tha Luang are leading attractions which should feature on any good Thailand itinerary.

Complete your Koh Samui trip with hotels and a car rental

  • We don't just compare flights. After booking your cheap ticket to Koh Samui Airport, explore our great car rental deals that'll give you the freedom to travel around at your own pace. Next, have a look at our exclusive rates for hotels to find the ideal Koh Samui stay.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.