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 Airport? If you want to travel next month, return fares start from ر.ق.‏ 5,314. Find the lowest prices on one-way and return tickets right here.

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.

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 foundر.ق.‏ 2,144
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 ر.ق.‏ 4,284. 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 ر.ق.‏ 4,284.
As of June 2026, there are no flights flying from Seattle to Samui International.
The cheapest month to fly from Seattle to Samui International is usually September.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Samui International Airport on Sunday, 20 September 2026.
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 Singapore Airlines .

Travelling from Seattle to Ko Samui International Airport (USM): What you need to know

  • Koh Samui is 15 hours ahead of Seattle. Ko Samui International Airport is located in Koh Samui, which operates on the UTC+7 timezone.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for hassle-free flying. Make sure you're at the airport on time to board your flight from Seattle to USM.

  • With more people on the move during peak months like July, get to the terminal earlier than usual. Two hours for domestic flights and as much as four for international journeys will help you deal with any delays. Remember things also get busy during major holidays like Christmas.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Whether you're hoping to visit a new place on the way or just take a break, we make it a breeze to book a flight with a stopover. To check out your options departing from Seattle-Tacoma International Airport (SEA), uncheck 'Direct flights only.' Singapore Changi Airport (SIN) is a stop you can make when searching for cheap flights from Seattle to USM.

  • Travelling from central Seattle to SEA takes around 35 minutes by public transport. If you drive, ride-share or take a taxi, you'll cover the 23 kilometres in 25 minutes or so, depending on traffic.

  • Catching an early flight from Seattle to Ko Samui International Airport? Avoid the last-minute rush to the terminal (and get some extra shut-eye) by choosing one of these hotels close to Seattle-Tacoma International Airport:

  • Seattle-Tacoma International Airport gets high marks for on-time performance. 80% of flights that take off from SEA arrive at their destination as scheduled.

Seattle Paine Field International Airport (PAE)

  • You can reach PAE from the centre of Seattle in approximately 40 minutes by car (depending on traffic). The journey by public transport takes roughly 1 hour 30 minutes to cover the 40 kilometres or so.

  • Kick off your holiday early with an extra night away from home. Before your Seattle to USM flight, unwind in one of these hotels near Seattle Paine Field International Airport:

  • Seattle Paine Field International Airport has a solid reputation for punctual service. 80% of flights out of here arrive right on target.

About Ko Samui International Airport (USM)

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

  • To secure the lowest price, reserve your vehicle around four weeks in advance of your Seattle to Ko Samui International Airport flight.

Getting from Ko Samui International Airport (USM) to central Koh Samui

  • Ko Samui International Airport is around 11 kilometres from central Koh Samui. It takes around 20 minutes or so to drive to the city.

  • It'll take around 30 minutes if you're using public transport.

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

  • ر.ق.‏ 2,144 is currently the best price for a one-way ticket from Seattle to Ko Samui International Airport. A return flight starts from ر.ق.‏ 4,284. These prices may change based on availability and demand.

  • Don't leave everything to the last moment. You're more likely to walk away with cheap flights from Seattle to USM if you book in advance. Airlines often offer some amazing early bird discounts.

  • The 'Whole month' search tool shows you the cheapest Seattle to Ko Samui International Airport tickets throughout the month. It's a great way to snap up a bargain if your plans aren't set in stone.

  • There's no need to check every day to find out if fares have dropped when you set up a Price Alert. We'll notify you as soon as a lower fare pops up on plane tickets from Seattle to USM.

  • Save money on your flight from Seattle to Ko Samui International Airport by using filters. Choose your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

The best time to fly from Seattle to Ko Samui International Airport (USM)

  • November is the busiest month for flights from Seattle to Ko Samui International Airport (USM). Plan your visit to Koh Samui in March for a quieter experience.

  • The warmest month in Koh Samui is May, with temperatures ranging between 25ºC and 30ºC. Lock in your Seattle to USM plane ticket then if you enjoy this type of weather.

  • If you'd rather travel in cooler conditions, look for a cheap ticket from Seattle to Ko Samui International Airport in January when temperatures are between 23ºC and 28ºC.

Explore more of Thailand

  • Nakhon Si Thammarat is just one of the many places in Thailand waiting to be explored once you've seen the sights of Koh Samui. Around 129 kilometres away to the south, well-known attractions include Wat Phra Phrom, Wat Pho Sadet and Wat Yai Chai Mongkol.

  • If you want to check out another corner of Thailand, consider Phuket, about 257 kilometres southwest of Koh Samui. V.MarineTour- Phi Phi Islands Day Trip - Private Boat Charters, Sunrise Beach and Paradise Beach are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.