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Cheap Flights from Seattle to Samui International

Compare Seattle 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 to Samui International

Looking for a cheap last-minute deal or the best return flight from Seattle to Samui International? Find the lowest prices on one-way and return tickets right here.
Koh Samui.696 € per passenger.Departing Wed, 3 Sep, returning Sun, 14 Sep.Return flight with Japan Airlines and Bangkok Airways.Outbound indirect flight with Japan Airlines, departs from Seattle / Tacoma International on Wed, 3 Sep, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Sun, 14 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 696 €, select.
Koh Samui.732 € per passenger.Departing Thu, 20 Nov, returning Fri, 28 Nov.Return flight with Singapore Airlines.Outbound indirect flight with Singapore Airlines, departs from Seattle / Tacoma International on Thu, 20 Nov, arriving in Samui International.Inbound indirect flight with Singapore Airlines, departs from Samui International on Fri, 28 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 732 €, select.
Koh Samui.868 € per passenger.Departing Mon, 20 Oct, returning Sun, 2 Nov.Return flight with Asiana Airlines and Bangkok Airways.Outbound indirect flight with Asiana Airlines, departs from Seattle / Tacoma International on Mon, 20 Oct, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Sun, 2 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 868 €, select.
Koh Samui.1.073 € per passenger.Departing Fri, 29 Aug, returning Tue, 2 Sep.Return flight with Singapore Airlines and Bangkok Airways.Outbound indirect flight with Singapore Airlines, departs from Seattle / Tacoma International on Fri, 29 Aug, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Tue, 2 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 1.073 €, select.
Koh Samui.1.149 € per passenger.Departing Sun, 3 Aug, returning Sun, 10 Aug.Return flight with Korean Air and Bangkok Airways.Outbound indirect flight with Korean Air, departs from Seattle / Tacoma International on Sun, 3 Aug, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Sun, 10 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 1.149 €, select.
Koh Samui.1.307 € per passenger.Departing Thu, 31 Jul, returning Thu, 7 Aug.Return flight with Asiana Airlines and Bangkok Airways.Outbound indirect flight with Asiana Airlines, departs from Seattle / Tacoma International on Thu, 31 Jul, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Thu, 7 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 1.307 €, select.
Koh Samui.1.315 € per passenger.Departing Sat, 28 Jun, returning Sun, 6 Jul.Return flight with Alaska Airlines and Bangkok Airways.Outbound indirect flight with Alaska Airlines, departs from Seattle / Tacoma International on Sat, 28 Jun, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Sun, 6 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 1.315 €, select.
Koh Samui.1.598 € per passenger.Departing Thu, 18 Dec, returning Wed, 31 Dec.Return flight with Asiana Airlines and Bangkok Airways.Outbound indirect flight with Asiana Airlines, departs from Seattle / Tacoma International on Thu, 18 Dec, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Wed, 31 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From 1.598 €, select.

Find the cheapest month to fly from Seattle to Samui International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle to Samui International flights are currently cheapest in September.
Jun
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Jul
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Aug
from 1.149 €
Sep
from 696 €
Oct
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Nov
from 732 €
Dec
from 1.598 €
Jan
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Feb
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Mar
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Apr
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May
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Seattle to Samui International: Alternative routes

Compare routes from Seattle 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 found696 €
Cheapest month to flySeptember

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

The best price we found for a return flight from Seattle to Samui International is 696 €. 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 to Samui International. But we found flights with one stop from 696 €.
As of June 2025, there are no flights flying from Seattle to Samui International.
The cheapest month to fly from Seattle to Samui International is usually June 2025.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Samui International Airport on Wednesday, 3 September 2025.
No airlines currently offer direct flights between Seattle 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.
The cheapest airline that flies to Samui International is Japan Airlines .

Flying from Seattle to Koh Samui Airport (USM): What you need to know

  • Set your travel plans in motion by considering where you'll board your flight from Seattle to Koh Samui Airport (USM). Seattle-Tacoma International Airport (SEA) and Lake Union Sea Plane Base Airport (LKE) are the two main airports in Seattle.

  • Koh Samui Airport is located in Koh Samui. The city operates on the UTC+7 timezone and is 14 hours ahead of Seattle.

  • To ensure you get on your flight from Seattle to USM, leave enough time for things like baggage drop and finding your gate. Arriving two hours before international departures and one hour before domestic flights is the general travel rule.

  • With more travellers during high season, aim to get to your terminal even earlier. Two hours for domestic flights and up to four for international journeys will allow extra time for delays.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Whether you're eager to explore a new city along the way or just have a break, we make it a breeze to find a flight with a stopover. To compare your options departing from Seattle-Tacoma International Airport (SEA), deselect 'Direct flights only.' Changi International Airport (SIN) is a stop you can make when searching for cheap flights from Seattle to USM.

  • Located around 23 kilometres from central Seattle, SEA can be reached in about 20 minutes by car (depending on traffic). The journey by public transport will take roughly 55 minutes.

  • Want a hassle-free start to your travels? Stay near Seattle-Tacoma International Airport. Whether you're catching an early flight from Seattle to Koh Samui Airport or prefer not to rush, these hotels offer the perfect solution:

  • 81.27% of flights departing from Seattle-Tacoma International Airport arrive at their destination according to schedule. With its strong performance rating, you're unlikely to experience delays when flying out of SEA.

Lake Union Sea Plane Base Airport (LKE)

  • You can reach LKE from the centre of Seattle in about 10 minutes by car (depending on traffic). The journey on public transport takes roughly 25 minutes to cover the 3 kilometres or so.

  • Want to enjoy an extra night away before catching your Seattle to USM flight? Check in to a hotel near Lake Union Sea Plane Base Airport before your adventure officially starts. These stays are expecting you:

About Koh Samui Airport (USM)

  • The last thing you need is a lengthy journey to your hotel if you're arriving on a late flight from Seattle to Koh Samui Airport. Stay at one of these accommodation options near USM instead:

  • Pick up a Koh Samui Airport rental car and discover Koh Samui and beyond with your own wheels. Asap car hire, Hertz and Drive Car Hire are leading providers you can book with here.

  • Lock in the lowest price by reserving your vehicle around four weeks before your Seattle to Koh Samui Airport flight.

How to find the cheapest flights from Seattle to Koh Samui Airport (USM)

  • 402 € is the lowest price for a one-way ticket from Seattle to Koh Samui Airport. Return flights start at 696 €. These prices can change based on availability.

  • Don't leave everything to the last moment. You're more likely to find cheap flights from Seattle to USM if you book ahead. Airlines often have some amazing early bird deals.

  • If you have some flexibility with your travel plans, use the 'Whole month' tool. It'll show you the cheapest price across every month when searching for your Seattle to Koh Samui Airport ticket.

  • Locking in a cheap plane ticket from Seattle 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 notify you as soon as prices go down.

  • Lock in a cheap flight from Seattle to Koh Samui Airport by using filters. Choose your preferred times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

Explore more of Thailand

  • You've seen Koh Samui, now it's time to discover more of Thailand. Travel around 129 kilometres south to Nakhon Si Thammarat to tick off its must-visit sights. From Wat Phra Phrom to Wat Pho Sadet and Wat Yai Chai Mongkol, you'll have a packed itinerary ahead.

  • Around 257 kilometres south-west of Koh Samui, Phuket is another essential stop in Thailand. Get a taste of what this destination has to offer at V.MarineTour- Phi Phi Islands Day Trip - Private Boat Charters, Sunrise Beach and Paradise Beach.

Plan the rest of your trip from Seattle to Koh Samui

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