$205 Cheap Flights from Philadelphia (PHL) to Santa Rosa (STS)

View $205 flight on Wed, Mar 4, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $205 for one-way flights and $392 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Fri, Dec 12 - Mon, Dec 15
PHL
Philadelphia
STS
Santa Rosa
$392 Roundtrip, found 2 hours ago
$392
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Fri, Dec 12 from Philadelphia to Santa Rosa, returning Mon, Dec 15, priced at $392 found 2 hours ago
Alaska Airlines
Thu, Jan 29 - Mon, Feb 2
PHL
Philadelphia
STS
Santa Rosa
$412 Roundtrip, found 1 hour ago
$412
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Jan 29 from Philadelphia to Santa Rosa, returning Mon, Feb 2, priced at $412 found 1 hour ago
Hawaiian Airlines
Tue, Jan 27 - Tue, Feb 10
PHL
Philadelphia
STS
Santa Rosa
$417 Roundtrip, found 7 hours ago
$417
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Tue, Jan 27 from Philadelphia to Santa Rosa, returning Tue, Feb 10, priced at $417 found 7 hours ago
Alaska Airlines
Tue, Feb 3 - Mon, Feb 9
PHL
Philadelphia
STS
Santa Rosa
$422 Roundtrip, found 8 hours ago
$422
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Philadelphia to Santa Rosa, returning Mon, Feb 9, priced at $422 found 8 hours ago
Hawaiian Airlines
Tue, Jan 6 - Fri, Jan 23
PHL
Philadelphia
STS
Santa Rosa
$423 Roundtrip, found 7 hours ago
$423
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Tue, Jan 6 from Philadelphia to Santa Rosa, returning Fri, Jan 23, priced at $423 found 7 hours ago
Alaska Airlines
Tue, Feb 3 - Mon, Feb 9
PHL
Philadelphia
STS
Santa Rosa
$426 Roundtrip, found 8 hours ago
$426
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Philadelphia to Santa Rosa, returning Mon, Feb 9, priced at $426 found 8 hours ago
Hawaiian Airlines
Wed, Jan 7 - Fri, Jan 23
PHL
Philadelphia
STS
Santa Rosa
$427 Roundtrip, found 7 hours ago
$427
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Wed, Jan 7 from Philadelphia to Santa Rosa, returning Fri, Jan 23, priced at $427 found 7 hours ago
American Airlines
Wed, Mar 4 - Tue, Mar 10
PHL
Philadelphia
STS
Santa Rosa
$431 Roundtrip, found 6 days ago
$431
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Mar 4 from Philadelphia to Santa Rosa, returning Tue, Mar 10, priced at $431 found 6 days ago
Hawaiian Airlines
Mon, Jan 12 - Thu, Jan 29
PHL
Philadelphia
STS
Santa Rosa
$432 Roundtrip, found 7 hours ago
$432
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Mon, Jan 12 from Philadelphia to Santa Rosa, returning Thu, Jan 29, priced at $432 found 7 hours ago
Southwest Airlines
Fri, Apr 10 - Mon, Apr 13
PHL
Philadelphia
STS
Santa Rosa
$509 Roundtrip, found 2 days ago
$509
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Fri, Apr 10 from Philadelphia to Santa Rosa, returning Mon, Apr 13, priced at $509 found 2 days ago

Find the cheapest month to fly from Philadelphia (PHL) to Santa Rosa (STS)

November is typically the cheapest month to fly

From $376 - $1,178 per traveler.

Alternative airports near Santa Rosa

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

Select flight to Sonoma County STS. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $799
STS
Sonoma County
CheapestClosest
Average driving time to city center10 min
Flights from $799

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) cost?
Secure a cheap one-way flight from $205 or cheap return flight from $392 from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) 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 Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS)?
The cheapest month to fly from PHL to STS is December, when there's less demand. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from PHL to STS. Then, sort your results by "Price (lowest to highest)" to score a good 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.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Sonoma County
Airlines serving
Alaska Airlines, American Airlines, Hawaiian Airlines
Roundtrip price
$392
Distance
2518 mi

Book with confidence

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 December. 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 $205 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.

 

Philadelphia to Santa Rosa Flights

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*Available to One Key members.