$518 Cheap Flights from San Diego (SAN) to Samui Intl. Airport (USM)

View $518 flight on Tue, Nov 25, 2025Opens in a new window

Popular airlines from San Diego Intl. Airport (SAN) to Samui Intl. Airport (USM)

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Cheap Flights from San Diego to Samui Intl. Airport (SAN-USM)

Prices were available within the past 7 days and start at $518 for one-way flights and $931 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Oct 28 - Mon, Nov 24
SAN
San Diego
USM
Koh Samui
$931 Roundtrip, found 19 hours ago
$931
Roundtrip
found 19 hours ago
Select United flight, departing Tue, Oct 28 from San Diego to Koh Samui, returning Mon, Nov 24, priced at $931 found 19 hours ago
United
Mon, Mar 30 - Mon, Apr 13
SAN
San Diego
USM
Koh Samui
$934 Roundtrip, found 6 days ago
$934
Roundtrip
found 6 days ago
Select United flight, departing Mon, Mar 30 from San Diego to Koh Samui, returning Mon, Apr 13, priced at $934 found 6 days ago
United
Wed, Apr 22 - Mon, May 11
SAN
San Diego
USM
Koh Samui
$936 Roundtrip, found 6 days ago
$936
Roundtrip
found 6 days ago
Select United flight, departing Wed, Apr 22 from San Diego to Koh Samui, returning Mon, May 11, priced at $936 found 6 days ago
United
Mon, Oct 27 - Tue, Nov 25
SAN
San Diego
USM
Koh Samui
$937 Roundtrip, found 19 hours ago
$937
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Oct 27 from San Diego to Koh Samui, returning Tue, Nov 25, priced at $937 found 19 hours ago
United
Wed, Oct 29 - Mon, Nov 24
SAN
San Diego
USM
Koh Samui
$940 Roundtrip, found 19 hours ago
$940
Roundtrip
found 19 hours ago
Select United flight, departing Wed, Oct 29 from San Diego to Koh Samui, returning Mon, Nov 24, priced at $940 found 19 hours ago
United
Wed, Jan 14 - Thu, Jan 22
SAN
San Diego
USM
Koh Samui
$940 Roundtrip, found 6 days ago
$940
Roundtrip
found 6 days ago
Select United flight, departing Wed, Jan 14 from San Diego to Koh Samui, returning Thu, Jan 22, priced at $940 found 6 days ago
Cathay Pacific
Tue, Mar 17 - Sun, Mar 22
SAN
San Diego
USM
Koh Samui
$1,311 Roundtrip, found 2 days ago
$1,311
Roundtrip
found 2 days ago
Select Cathay Pacific flight, departing Tue, Mar 17 from San Diego to Koh Samui, returning Sun, Mar 22, priced at $1,311 found 2 days ago
Japan Airlines
Mon, Nov 17 - Mon, Nov 24
SAN
San Diego
USM
Koh Samui
$1,444 Roundtrip, found 3 days ago
$1,444
Roundtrip
found 3 days ago
Select Japan Airlines flight, departing Mon, Nov 17 from San Diego to Koh Samui, returning Mon, Nov 24, priced at $1,444 found 3 days ago
Lufthansa
Wed, Dec 10 - Tue, Dec 23
SAN
San Diego
USM
Koh Samui
$1,796 Roundtrip, found 5 days ago
$1,796
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Dec 10 from San Diego to Koh Samui, returning Tue, Dec 23, priced at $1,796 found 5 days ago
KLM
Sat, Mar 21 - Wed, Apr 1
SAN
San Diego
USM
Koh Samui
$1,815 Roundtrip, found 19 hours ago
$1,815
Roundtrip
found 19 hours ago
Select KLM flight, departing Sat, Mar 21 from San Diego to Koh Samui, returning Wed, Apr 1, priced at $1,815 found 19 hours ago

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 $931
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $931

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM) cost?
Secure a cheap one-way flight from $518 or cheap return flight from $931 from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM) 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 San Diego Intl. Airport (SAN) to Ko Samui Airport (USM)?
Flying in October is a great way to save, as it's the cheapest month for flights between SAN and USM. You'll typically find the lowest fares during off-peak months.
What is the cheapest airline that flies from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SAN to USM flight.
How many flights per day from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM)?
There aren't any daily nonstop flights available from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from SAN to USM?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*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 Diego Intl. Airport (SAN) to Ko Samui Airport (USM)?
To avoid potential delays on the San Diego Intl. Airport (SAN) to Ko Samui Airport (USM) route, travel before 3 PM. Flights after this time 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 Diego Intl. Airport (SAN) to Ko Samui Airport (USM) last-minute?
Holding off until right before your break to book a ticket from SAN to USM often results in higher prices. Although you may find some last-minute offers, they aren't always guaranteed. Be flexible with your travel plans to maximize your chances of snagging a bargain.
Is it cheaper to book a SAN to USM flight and hotel package?
You'll generally save money by booking a SAN to USM flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've chosen your preferred accommodations and flights, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Ko Samui Airport (USM)?
If you booked your SAN to USM flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more information.

Travel information

Origin airport
San Diego Intl.
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific, Japan Airlines, KLM, Lufthansa
Roundtrip price
$931
Distance
8621 mi

Book with confidence

San Diego to Samui Intl. Airport Flights

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

 

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

Sunday is one of the best days to book for cheap flights from San Diego 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 Diego 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 Diego to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $518 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 Diego 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 Diego 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 Diego to Samui Intl. Airport Flights
*Available to One Key members.