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Cheap Flights from San Francisco (SFO) to Koh Samui (USM)

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Compare San Francisco 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 San Francisco International to Samui International

Looking for a cheap last-minute deal or the best return flight from San Francisco International to Samui International? Find the lowest prices on one-way and return tickets right here.
Koh Samui.$1,312 per passenger.Departing Thu, 18 Sep, returning Thu, 25 Sep.Return flight with Japan Airlines and Bangkok Airways.Outbound indirect flight with Japan Airlines, departs from San Francisco International on Thu, 18 Sep, arriving in Samui International.Inbound indirect flight with Bangkok Airways, departs from Samui International on Thu, 25 Sep, arriving in San Francisco International.Price includes taxes and charges.From $1,312, select.
Koh Samui.$1,893 per passenger.Departing Fri, 15 Aug, returning Mon, 25 Aug.Return flight with EVA Air.Outbound indirect flight with EVA Air, departs from San Francisco International on Fri, 15 Aug, arriving in Samui International.Inbound indirect flight with EVA Air, departs from Samui International on Mon, 25 Aug, arriving in San Francisco International.Price includes taxes and charges.From $1,893, select.
Koh Samui.$2,007 per passenger.Departing Thu, 19 Jun, returning Thu, 26 Jun.Return flight with United and Scoot.Outbound indirect flight with United, departs from San Francisco International on Thu, 19 Jun, arriving in Samui International.Inbound indirect flight with Scoot, departs from Samui International on Thu, 26 Jun, arriving in San Francisco International.Price includes taxes and charges.From $2,007, select.
Koh Samui.$2,237 per passenger.Departing Thu, 10 Jul, returning Thu, 24 Jul.Return flight with EVA Air.Outbound indirect flight with EVA Air, departs from San Francisco International on Thu, 10 Jul, arriving in Samui International.Inbound indirect flight with EVA Air, departs from Samui International on Thu, 24 Jul, arriving in San Francisco International.Price includes taxes and charges.From $2,237, select.
Koh Samui.$2,468 per passenger.Departing Tue, 29 Jul, returning Tue, 5 Aug.Return flight with EVA Air.Outbound indirect flight with EVA Air, departs from San Francisco International on Tue, 29 Jul, arriving in Samui International.Inbound indirect flight with EVA Air, departs from Samui International on Tue, 5 Aug, arriving in San Francisco International.Price includes taxes and charges.From $2,468, select.

The cheapest month to fly from San Francisco International Airport to Samui International Airport

We’re always keeping an eye on fares, to help you find the lowest one in seconds. Check out the San Francisco International Airport to Samui International Airport flight prices forecast over the next 12 months.
Jun
from $2,007
Jul
from $2,237
Aug
from $1,893
Sep
from $1,312
Oct
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Nov
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Dec
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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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Cheapest month:September
Most expensive month:July

San Francisco International to Samui International: Alternative routes

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

San Francisco to Koh Samui: Flight information

The things to know before you go.
Cheapest flight found$1,312
Cheapest month to flySeptember

Finding cheap flights from San Francisco International to Samui International: Frequently asked questions

The best price we found for a return flight from San Francisco International to Samui International is $1,312. 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 San Francisco International to Samui International. But we found flights with one or more stops from $1,312.
As of June 2025, there are no flights flying from San Francisco International to Samui International.
The cheapest month to fly from San Francisco International to Samui International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Francisco International Airport to Samui International Airport on Thursday, 18 September 2025.
No airlines currently offer direct flights between San Francisco 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, Japan Airlines offers the cheapest flight tickets to Samui International.

Flying from San Francisco International Airport (SFO) to Koh Samui Airport (USM): what you need to know

  • Get to the airport on time so you don't miss your SFO to USM flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid sprinting to your gate.

  • Travelling during a peak time like August? School holidays and other popular seasons can lead to longer queues and delays at security. Be extra cautious and arrive up to four hours ahead of an international flight and two hours before a domestic departure.

  • If you want to visit a new city along the way, look for a flight with a stopover. To see all your options for tickets from San Francisco International Airport to Koh Samui Airport, uncheck 'Direct flights only.' Changi International Airport is a sought-after stop between SFO and USM.

How to find the cheapest flights from San Francisco International Airport (SFO) to Koh Samui Airport (USM)

  • $781 is the lowest price for a one-way San Francisco International Airport to Koh Samui Airport flight. A return flight starts from $1,312. These prices can change based on availability and demand.

  • It's often best to book ahead of time if you want to find cheap tickets from SFO to USM. That's because airlines change prices based on demand, which tends to increase closer to the date of departure.

  • If you're willing to be flexible with your travel dates, try using the 'Whole month' tool. It'll give you the lowest price across the month when looking for a flight from San Francisco International Airport to Koh Samui Airport.

  • Spend less time searching for cheap flights from SFO to USM by creating a Price Alert. You'll get an email or notification through the app when a lower fare becomes available.

  • Discover the right flight for you with the help of the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from San Francisco International Airport to Koh Samui Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and journey duration.

Handy information about San Francisco International Airport (SFO)

  • When it comes to the on-time performance of San Francisco International Airport, 77.36% of flights stick to their scheduled arrival time.

  • San Francisco International Airport is about 21 kilometres from central San Francisco. If you're driving, ride-sharing or catching a cab from the centre, it'll take 20 minutes or so to arrive, depending on the traffic.

  • The trip when using public transport typically takes 45 minutes.

  • Have an early flight from San Francisco International Airport to Koh Samui Airport? Avoid rushing to the airport (and catch some extra z's) by picking one of these hotels close to SFO:

Arriving at Koh Samui Airport (USM)

  • If you're arriving on a late San Francisco International Airport to Koh Samui Airport flight, nothing tops the convenience of staying near the terminal. Collect your bags from the carousel and then be showered and sleeping not long after at one of these hotels near USM:

  • 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 to choose from here.

  • To get the best deal, book your ride from Koh Samui Airport around four weeks before travelling.

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

  • Koh Samui Airport to central Koh Samui is about 3 kilometres. Journey times can vary depending on traffic and the time of day, so checking a navigation app for live updates is recommended.

When to fly to Koh Samui Airport (USM)

  • It's time to pick your dates for your flight from San Francisco International Airport to Koh Samui Airport. July is the most popular month to head to Koh Samui. If you like a more low-key vibe, go in February.

Explore more of Thailand

  • Bangkok is just one of the many places in Thailand waiting to be discovered after you've experienced Koh Samui. Around 467 kilometres away to the north, check out popular attractions including Grand Palace, Wat Arun and Wat Phra Kaew.

  • Chon Buri is another well-known destination in Thailand and is around 434 kilometres north of Koh Samui. No trip is complete without a visit to Wat Ton Son, Forest and Phra Phutthasihing Hall.

Plan the rest of your trip from San Francisco to Koh Samui

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