$515 Cheap Flights from Samui Intl. Airport (USM) to San Francisco (SFO)

View $515 flight on Tue, May 12, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $515 for one-way flights and $985 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

EVA Airways
Sat, Feb 14 - Mon, Feb 23
USM
Koh Samui
SFO
San Francisco
$985 Roundtrip, found 3 days ago
$985
Roundtrip
found 3 days ago
Select EVA Airways flight, departing Sat, Feb 14 from Koh Samui to San Francisco, returning Mon, Feb 23, priced at $985 found 3 days ago
EVA Airways
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$992 Roundtrip, found 5 days ago
$992
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $992 found 5 days ago
EVA Airways
Sat, Feb 14 - Mon, Feb 23
USM
Koh Samui
SFO
San Francisco
$1,045 Roundtrip, found 3 days ago
$1,045
Roundtrip
found 3 days ago
Select EVA Airways flight, departing Sat, Feb 14 from Koh Samui to San Francisco, returning Mon, Feb 23, priced at $1,045 found 3 days ago
EVA Airways
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$1,054 Roundtrip, found 5 days ago
$1,054
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $1,054 found 5 days ago
EVA Airways
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$1,115 Roundtrip, found 5 days ago
$1,115
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $1,115 found 5 days ago
Bangkok Airways
Sat, Feb 14 - Mon, Feb 23
USM
Koh Samui
SFO
San Francisco
$1,159 Roundtrip, found 3 days ago
$1,159
Roundtrip
found 3 days ago
Select Bangkok Airways flight, departing Sat, Feb 14 from Koh Samui to San Francisco, returning Mon, Feb 23, priced at $1,159 found 3 days ago
Bangkok Airways
Sat, Feb 14 - Mon, Feb 23
USM
Koh Samui
SFO
San Francisco
$1,169 Roundtrip, found 3 days ago
$1,169
Roundtrip
found 3 days ago
Select Bangkok Airways flight, departing Sat, Feb 14 from Koh Samui to San Francisco, returning Mon, Feb 23, priced at $1,169 found 3 days ago
China Airlines
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$1,227 Roundtrip, found 5 days ago
$1,227
Roundtrip
found 5 days ago
Select China Airlines flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $1,227 found 5 days ago
Cathay Pacific
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$1,318 Roundtrip, found 5 days ago
$1,318
Roundtrip
found 5 days ago
Select Cathay Pacific flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $1,318 found 5 days ago
Qatar Airways
Thu, Oct 16 - Mon, Oct 20
USM
Koh Samui
SFO
San Francisco
$1,510 Roundtrip, found 5 days ago
$1,510
Roundtrip
found 5 days ago
Select Qatar Airways flight, departing Thu, Oct 16 from Koh Samui to San Francisco, returning Mon, Oct 20, priced at $1,510 found 5 days ago

Frequently asked questions

How much does a flight from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO) cost?
Grab a cheap one-way flight from $515 or cheap return flight from $985 from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO)?
Traveling in February can help you save, as it's the cheapest month for flights between USM and SFO. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from USM to SFO. Then, sort your results by "Price (lowest to highest)" to pick up a good deal.
How many flights per day from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO)?
Direct flights from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from USM to SFO?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change based on a number of factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO)?
Select a flight from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO) that takes off before 3 PM to reduce the likelihood of delays. Departures after this time are on average 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 Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO) last-minute?
Booking your plane ticket from USM to SFO right before your journey is generally more expensive. But if you're flexible with your travel times and dates, you could land a cheap last-minute fare.
Is it cheaper to book an USM to SFO flight and hotel package?
Compared with arranging flights and hotels separately, booking an USM to SFO flight and hotel package with Expedia could result in significant savings. What's more, having it all in one place will take the hassle out of travel planning. Just secure your flights and select from our extensive range of stays, then personalize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Ko Samui Airport (USM) to San Francisco Intl. Airport (SFO)?
If you booked your USM to SFO flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

Travel information

Travel information

Origin airport
Samui Intl. Airport
Destination airport
San Francisco Intl.
Roundtrip price
$985
Distance
8177 mi

Book with confidence

Book with confidence

Samui Intl. Airport to San Francisco Flights

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

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 Samui Intl. Airport to San Francisco are during the month of February. You can find some of the cheapest flights from Samui Intl. Airport to San Francisco with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Samui Intl. Airport to San Francisco: 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 Samui Intl. Airport to San Francisco

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 Samui Intl. Airport to San Francisco in 2025. You can also book with separate airlines for your outbound and return journeys, from $515 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 Samui Intl. Airport to San Francisco 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 Samui Intl. Airport to San Francisco 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.

 

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