$78 Cheap Flights from Santa Rosa (STS) to San Diego (SAN)

View $78 flight on Tue, Oct 28, 2025Opens in a new window

Popular airlines from Santa Rosa, CA (STS-Sonoma County) to San Diego Intl. Airport (SAN)

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Cheap Flights from Santa Rosa to San Diego (STS-SAN)

Prices were available within the past 7 days and start at $78 for one-way flights and $137 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Sat, Nov 8 - Wed, Nov 12
STS
Santa Rosa
SAN
San Diego
$137 Roundtrip, found 18 hours ago
$137
Roundtrip
found 18 hours ago
Select Hawaiian Airlines flight, departing Sat, Nov 8 from Santa Rosa to San Diego, returning Wed, Nov 12, priced at $137 found 18 hours ago
Alaska Airlines
Sat, Oct 4 - Mon, Oct 6
STS
Santa Rosa
SAN
San Diego
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Oct 4 from Santa Rosa to San Diego, returning Mon, Oct 6, priced at $157 found 1 hour ago
American Airlines
Sat, Sep 27 - Tue, Sep 30
STS
Santa Rosa
SAN
San Diego
$159 Roundtrip, found 1 hour ago
$159
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Sat, Sep 27 from Santa Rosa to San Diego, returning Tue, Sep 30, priced at $159 found 1 hour ago
Alaska Airlines
Sat, Oct 25 - Tue, Oct 28
STS
Santa Rosa
SAN
San Diego
$167 Roundtrip, found 4 hours ago
$167
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Oct 25 from Santa Rosa to San Diego, returning Tue, Oct 28, priced at $167 found 4 hours ago
Alaska Airlines
Wed, Oct 15 - Wed, Oct 22
STS
Santa Rosa
SAN
San Diego
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Oct 15 from Santa Rosa to San Diego, returning Wed, Oct 22, priced at $177 just found
American Airlines
Sat, Oct 11 - Wed, Oct 15
STS
Santa Rosa
SAN
San Diego
$180 Roundtrip, found 1 day ago
$180
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Oct 11 from Santa Rosa to San Diego, returning Wed, Oct 15, priced at $180 found 1 day ago
American Airlines
Wed, Oct 1 - Wed, Nov 5
STS
Santa Rosa
SAN
San Diego
$183 Roundtrip, found 8 hours ago
$183
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Wed, Oct 1 from Santa Rosa to San Diego, returning Wed, Nov 5, priced at $183 found 8 hours ago
American Airlines
Wed, Sep 24 - Mon, Sep 29
STS
Santa Rosa
SAN
San Diego
$185 Roundtrip, found 9 hours ago
$185
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Wed, Sep 24 from Santa Rosa to San Diego, returning Mon, Sep 29, priced at $185 found 9 hours ago
American Airlines
Sat, Sep 27 - Tue, Sep 30
STS
Santa Rosa
SAN
San Diego
$186 Roundtrip, found 1 hour ago
$186
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Sat, Sep 27 from Santa Rosa to San Diego, returning Tue, Sep 30, priced at $186 found 1 hour ago
American Airlines
Sat, Oct 25 - Tue, Oct 28
STS
Santa Rosa
SAN
San Diego
$190 Roundtrip, found 4 hours ago
$190
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sat, Oct 25 from Santa Rosa to San Diego, returning Tue, Oct 28, priced at $190 found 4 hours ago

Find the cheapest month to fly from Santa Rosa (STS) to San Diego (SAN)

January is typically the cheapest month to fly

From $116 - $266 per traveler.

Alternative airports near San Diego

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

Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $543
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $543
Flights from Santa Rosa (STS) to San Diego (SAN)
Origin airport
Sonoma County
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Hawaiian Airlines
Roundtrip price
$135
Distance
508 mi
Average flight time
1 hour 45 mins

Santa Rosa to San Diego Flights

The cheapest times to fly from Santa Rosa to San Diego

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 Santa Rosa to San Diego are during the month of November. You can find some of the cheapest flights from Santa Rosa to San Diego with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Santa Rosa to San Diego

Sunday is one of the best days to book for cheap flights from Santa Rosa to San Diego: 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 Santa Rosa to San Diego

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 Santa Rosa to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $78 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 Santa Rosa to San Diego 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 Santa Rosa to San Diego 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.

 

Frequently asked questions

How much does a flight from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN) cost?
Get a cheap one-way flight from $78 or cheap return flight from $137 from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Flying in November can help you save, as it's the cheapest month for flights between STS and SAN. You'll often find the lowest fares during the off-season.
Which airlines fly direct from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
When setting off from Sonoma County Airport (STS), you can get on a nonstop flight to San Diego Intl. Airport (SAN) with Alaska Airlines.
What is the cheapest airline that flies from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STS to SAN flight.
How many flights per day from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
On average, just 1 direct flight departs each day from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN). Looking for more options? Use our filter tool to discover flights with layovers and squeeze in a visit to another city along the way.
What are the most popular departure times for flights from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Flights between STS and SAN are busiest at 6 AM. For a more relaxed atmosphere and potentially cheaper tickets, choose a time outside the usual busy windows.
What day of the week has the most flights from STS to SAN?
If you travel on a Friday, you'll get the biggest range of choices for flights from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN).
What is the earliest flight from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Catch the earliest flight at around 6:00AM UTC-8, leaving from Sonoma County Airport (STS). You'll be traveling for around 1h 40m, coming in to land at San Diego Intl. Airport (SAN) at approximately 7:40AM UTC-8.
How long does it take to fly from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Flights from STS to SAN have an average travel time of 1 hour and 38 minutes. The distance between the two is 510 mi.
What is the best time to fly from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
Book a flight from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures later than this have a 22% higher chance of being canceled, on average.**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.
What airports do you fly into for San Diego from Sonoma County Airport (STS)?
Browse your flight options from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN). This is the only San Diego airport you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN) last-minute?
Booking your ticket from STS to SAN just before your trip is generally more expensive. However, if there's some wiggle room with your itinerary, you could land a cheap last-minute fare.
Is it cheaper to book a STS to SAN flight and hotel package?
Compared with arranging hotels and flights separately, booking a STS to SAN flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one convenient place will take the stress out of travel planning. Just pick your flights and select from our wide range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Sonoma County Airport (STS) to San Diego Intl. Airport (SAN)?
If you reserved your STS to SAN 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 fare 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 if you'd like more information.

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*Available to One Key members.