$351 Cheap Flights from San Francisco (SFO) to Samui Intl. Airport (USM)

View $351 flight on Sun, Feb 22, 2026Opens in a new window

Popular airlines from San Francisco Intl. Airport (SFO) to Samui Intl. Airport (USM)

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Cheap Flights from San Francisco to Samui Intl. Airport (SFO-USM)

Prices were available within the past 7 days and start at $351 for one-way flights and $628 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Jan 31 - Sat, Feb 7
SFO
San Francisco
USM
Koh Samui
$628 Roundtrip, found 21 hours ago
$628
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Jan 31 from San Francisco to Koh Samui, returning Sat, Feb 7, priced at $628 found 21 hours ago
United
Thu, Jan 29 - Sun, Feb 8
SFO
San Francisco
USM
Koh Samui
$636 Roundtrip, found 17 hours ago
$636
Roundtrip
found 17 hours ago
Select United flight, departing Thu, Jan 29 from San Francisco to Koh Samui, returning Sun, Feb 8, priced at $636 found 17 hours ago
United
Sat, Jan 31 - Sat, Feb 7
SFO
San Francisco
USM
Koh Samui
$648 Roundtrip, found 21 hours ago
$648
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Jan 31 from San Francisco to Koh Samui, returning Sat, Feb 7, priced at $648 found 21 hours ago
United
Thu, Jan 29 - Sun, Feb 8
SFO
San Francisco
USM
Koh Samui
$656 Roundtrip, found 17 hours ago
$656
Roundtrip
found 17 hours ago
Select United flight, departing Thu, Jan 29 from San Francisco to Koh Samui, returning Sun, Feb 8, priced at $656 found 17 hours ago
United
Sun, Jan 11 - Sat, Jan 31
SFO
San Francisco
USM
Koh Samui
$656 Roundtrip, found 2 days ago
$656
Roundtrip
found 2 days ago
Select United flight, departing Sun, Jan 11 from San Francisco to Koh Samui, returning Sat, Jan 31, priced at $656 found 2 days ago
United
Tue, Feb 17 - Mon, Mar 2
SFO
San Francisco
USM
Koh Samui
$698 Roundtrip, found 22 hours ago
$698
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Feb 17 from San Francisco to Koh Samui, returning Mon, Mar 2, priced at $698 found 22 hours ago
Singapore Airlines
Mon, Nov 10 - Mon, Nov 17
SFO
San Francisco
USM
Koh Samui
$823 Roundtrip, found 2 days ago
$823
Roundtrip
found 2 days ago
Select Singapore Airlines flight, departing Mon, Nov 10 from San Francisco to Koh Samui, returning Mon, Nov 17, priced at $823 found 2 days ago
EVA Airways
Thu, Nov 13 - Mon, Nov 17
SFO
San Francisco
USM
Koh Samui
$1,003 Roundtrip, found 7 hours ago
$1,003
Roundtrip
found 7 hours ago
Select EVA Airways flight, departing Thu, Nov 13 from San Francisco to Koh Samui, returning Mon, Nov 17, priced at $1,003 found 7 hours ago
China Airlines
Thu, Nov 6 - Mon, Nov 10
SFO
San Francisco
USM
Koh Samui
$1,187 Roundtrip, found 7 hours ago
$1,187
Roundtrip
found 7 hours ago
Select China Airlines flight, departing Thu, Nov 6 from San Francisco to Koh Samui, returning Mon, Nov 10, priced at $1,187 found 7 hours ago
Cathay Pacific
Sun, Oct 19 - Thu, Oct 23
SFO
San Francisco
USM
Koh Samui
$1,380 Roundtrip, found 8 hours ago
$1,380
Roundtrip
found 8 hours ago
Select Cathay Pacific flight, departing Sun, Oct 19 from San Francisco to Koh Samui, returning Thu, Oct 23, priced at $1,380 found 8 hours ago

Find the cheapest month to fly from San Francisco (SFO) to Koh Samui (USM)

September is typically the cheapest month to fly

From $695 - $1,149 per traveler.

Alternative airports near Koh Samui

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Samui Intl. Airport USM. Cheapest and Closest option available. Average driving time to city center is 31 minutes. Flights from $1,043
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $1,043

Frequently asked questions

How much does a flight from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM) cost?
Snag a cheap one-way flight from $351 or cheap return flight from $628 from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM)?
Traveling in January is a good way to save, as it's the cheapest month for flights between SFO and USM. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM)?
To find the cheapest airline that'll fly you from SFO to USM, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM)?
Direct flights from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SFO to USM?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM)?
To avoid potential delays on the San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM) route, fly before 3 PM. Departures after this hour are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM) last-minute?
Booking your ticket from SFO to USM just before your journey is typically more expensive. However, if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a SFO to USM flight and hotel package?
Opting for a SFO to USM flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our impressive range of hotels and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Francisco Intl. Airport (SFO) to Ko Samui Airport (USM)?
In most instances, you can cancel or reschedule your SFO to USM flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you'd like further information, go to our Customer Service portal.

Travel information

Travel information

Origin airport
San Francisco Intl.
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific, China Airlines, EVA Airways, Japan Airlines, Lufthansa, Qatar Airways, Singapore Airlines, Turkish Airlines
Roundtrip price
$628
Distance
8177 mi

Book with confidence

Book with confidence

San Francisco to Samui Intl. Airport Flights

The cheapest times to fly from San Francisco to Samui Intl. Airport

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Francisco to Samui Intl. Airport are during the month of January. You can find some of the cheapest flights from San Francisco to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Francisco to Samui Intl. Airport

Sunday is one of the best days to book for cheap flights from San Francisco to Samui Intl. Airport: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Francisco to Samui Intl. Airport

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Francisco to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $351 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Francisco to Samui Intl. Airport flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Francisco to Samui Intl. Airport airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Francisco to Samui Intl. Airport Flights
*Available to One Key members.