$226 Cheap Flights from Philadelphia (PHL) to Santa Rosa (STS)

View $226 flight on Tue, May 13, 2025Opens in a new window

Popular airlines from Philadelphia Intl. Airport (PHL) to Santa Rosa, CA (STS-Sonoma County)

Find available prices by choosing your travel dates.

Cheap Flights from Philadelphia to Santa Rosa (PHL-STS)

Prices were available within the past 7 days and start at $226 for one-way flights and $447 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, May 13 - Tue, May 20
PHL
Philadelphia
STS
Santa Rosa
$447 Roundtrip, found 3 days ago
$447
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, May 13 from Philadelphia to Santa Rosa, returning Tue, May 20, priced at $447 found 3 days ago
Alaska Airlines
Wed, Sep 24 - Tue, Sep 30
PHL
Philadelphia
STS
Santa Rosa
$458 Roundtrip, found 10 hours ago
$458
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Wed, Sep 24 from Philadelphia to Santa Rosa, returning Tue, Sep 30, priced at $458 found 10 hours ago
Alaska Airlines
Tue, May 13 - Tue, May 20
PHL
Philadelphia
STS
Santa Rosa
$460 Roundtrip, found 3 days ago
$460
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, May 13 from Philadelphia to Santa Rosa, returning Tue, May 20, priced at $460 found 3 days ago
American Airlines
Wed, Sep 24 - Tue, Sep 30
PHL
Philadelphia
STS
Santa Rosa
$465 Roundtrip, found 10 hours ago
$465
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Sep 24 from Philadelphia to Santa Rosa, returning Tue, Sep 30, priced at $465 found 10 hours ago
Alaska Airlines
Tue, May 13 - Tue, May 20
PHL
Philadelphia
STS
Santa Rosa
$484 Roundtrip, found 3 days ago
$484
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, May 13 from Philadelphia to Santa Rosa, returning Tue, May 20, priced at $484 found 3 days ago
Alaska Airlines
Tue, Aug 12 - Tue, Aug 19
PHL
Philadelphia
STS
Santa Rosa
$508 Roundtrip, found 15 hours ago
$508
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Tue, Aug 12 from Philadelphia to Santa Rosa, returning Tue, Aug 19, priced at $508 found 15 hours ago
Alaska Airlines
Wed, Sep 24 - Tue, Sep 30
PHL
Philadelphia
STS
Santa Rosa
$516 Roundtrip, found 10 hours ago
$516
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Wed, Sep 24 from Philadelphia to Santa Rosa, returning Tue, Sep 30, priced at $516 found 10 hours ago
American Airlines
Wed, Sep 24 - Tue, Sep 30
PHL
Philadelphia
STS
Santa Rosa
$516 Roundtrip, found 10 hours ago
$516
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Sep 24 from Philadelphia to Santa Rosa, returning Tue, Sep 30, priced at $516 found 10 hours ago
Alaska Airlines
Tue, May 13 - Tue, May 20
PHL
Philadelphia
STS
Santa Rosa
$520 Roundtrip, found 3 days ago
$520
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, May 13 from Philadelphia to Santa Rosa, returning Tue, May 20, priced at $520 found 3 days ago
Hawaiian Airlines
Wed, Aug 20 - Tue, Sep 9
PHL
Philadelphia
STS
Santa Rosa
$544 Roundtrip, found 3 days ago
$544
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Wed, Aug 20 from Philadelphia to Santa Rosa, returning Tue, Sep 9, priced at $544 found 3 days ago
Flights from Philadelphia (PHL) to Santa Rosa (STS)
Origin airport
Philadelphia Intl.
Destination airport
Sonoma County
Airlines serving
Alaska Airlines, American Airlines, Hawaiian Airlines
Roundtrip price
$447
Distance
2518 mi

Philadelphia to Santa Rosa Flights

The cheapest times to fly from Philadelphia to Santa Rosa

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

The best time to book a flight from Philadelphia to Santa Rosa

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

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 Philadelphia to Santa Rosa in 2025. You can also book with separate airlines for your outbound and return journeys, from $226 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 Philadelphia to Santa Rosa 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 Philadelphia to Santa Rosa 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 Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) cost?
Discover the latest flight deals from PHL to STS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from PHL to STS?
The cheapest flights from PHL to STS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from PHL to STS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from PHL to STS. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS)?
You’ll need to book a flight with a layover when traveling from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS). Direct flights don’t operate daily on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from PHL to STS?
Generally you’ll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can change depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS)?
To avoid possible delays on the Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) route, aim to 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.
What airports do you fly into for Santa Rosa from Philadelphia Intl. Airport (PHL)?
Explore your flight options from Philadelphia Intl. Airport (PHL) to San Francisco Intl. Airport (SFO). This is the only airport in Santa Rosa you can arrive at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) last-minute?
Booking your flight from PHL to STS just before your journey is usually more expensive. But if you’re flexible with your travel dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a PHL to STS flight and hotel package?
Compared with arranging hotels and flights separately, booking a PHL to STS flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place will take the hassle out of planning your trip. Simply pick your flights and select from our wide range of stays, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS)?
If you booked your PHL to STS flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of ticket you have, 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 if you’d like more information.

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*Available to One Key members.