PHL - STS

$174 Find Cheap Flights from Philadelphia to Santa Rosa

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Santa Rosa departing on 3/24. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Santa Rosa

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Santa Rosa, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Santa Rosa, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$375
Overall average: $858
Alaska Airlines
Wed 4/8Tue 4/21
PHL - STS • 2 stops
Cheapest one-way
$174
Alaska Airlines
Tue 3/24
PHL - STS • 1 stop
Top airlines
Alaska Airlines
Cheapest • from $375 (round-trip)
American Airlines
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
March
Cheapest • 61% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Santa Rosa!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Santa Rosa that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Santa Rosa

Wed, Apr 8 - Tue, Apr 21
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$375Alaska Airlines
Tue, Mar 24 - Tue, Mar 31
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$395Alaska Airlines
Mon, Mar 23 - Tue, Mar 31
Alaska Airlines Logo
6:47 pm - 10:30 am
PHL
-
STS
18h 43m
1 stop
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$420Alaska Airlines
Mon, Mar 23 - Mon, Mar 30
Alaska Airlines Logo
6:47 pm - 6:01 pm
PHL
-
STS
26h 14m
1 stop
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$433Alaska Airlines
Wed, Apr 8 - Sat, Apr 18
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$435Alaska Airlines
Wed, Apr 8 - Sat, Apr 18
Alaska Airlines Logo
7:25 am - 6:01 pm
PHL
-
STS
13h 36m
1 stop
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$438Alaska Airlines
Tue, Apr 14 - Tue, Apr 21
Alaska Airlines Logo
7:25 am - 5:10 pm
PHL
-
STS
12h 45m
2 stops
Alaska Airlines Logo
7:30 am - 6:05 am
STS
-
PHL
19h 35m
2 stops
$454Alaska Airlines
Thu, Apr 9 - Tue, Apr 21
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$455Alaska Airlines
Wed, Apr 8 - Mon, Apr 20
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
6:53 pm - 6:05 am
STS
-
PHL
8h 12m
1 stop
$456Alaska Airlines
Wed, Apr 8 - Mon, Apr 20
Alaska Airlines Logo
7:25 am - 11:15 pm
PHL
-
STS
18h 50m
2 stops
Alaska Airlines Logo
7:02 pm - 5:47 pm
STS
-
PHL
19h 45m
2 stops
$463Alaska Airlines
Booking Insights

KAYAK's insights & trends for Philadelphia to Santa Rosa flights

Get data-powered insights and trends into flights from Philadelphia to Santa Rosa to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Philadelphia to Santa Rosa?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Santa Rosa, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Santa Rosa is March, where tickets cost $256 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $1,088 and $858 respectively.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$174
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Philadelphia to Santa Rosa

When to book flights from Philadelphia to Santa Rosa

Are your dates flexible? Find out the best times to travel from Philadelphia to Santa Rosa based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Santa Rosa

  • What is the cheapest flight from Philadelphia to Santa Rosa?

    In the last 3 days, the lowest price for a flight from Philadelphia to Santa Rosa was $174 for a one-way ticket and $375 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Santa Rosa?

    No, a passport isn't needed to fly from Philadelphia to Santa Rosa. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Philadelphia to Santa Rosa?

    Philadelphia and Santa Rosa are both served by 1 main airport. You will leave Philadelphia from Philadelphia and will be arriving at Santa Rosa Sonoma County.

  • Which aircraft models fly most regularly from Philadelphia to Santa Rosa?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Santa Rosa?

    oneworld is the only airline alliance operating flights between Philadelphia and Santa Rosa.

  • How does KAYAK find such low prices on flights from Philadelphia to Santa Rosa?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Santa Rosa.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Santa Rosa?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Santa Rosa from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Santa Rosa?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Santa Rosa with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and STS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Santa Rosa?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Santa Rosa from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Philadelphia to Santa Rosa

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Santa Rosa. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Santa Rosa? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
American AirlinesOverall score based on 11275 reviews
8.0Crew
6.4Food
7.5Boarding
6.9Entertainment
7.2Comfort
Airline reviews

They are always late and seats was also not having working charger

6.0 GoodDheeraj, Feb 2026
PHL - LAX
Read more American Airlines reviews

They are always late and seats was also not having working charger

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Long delays, lack of information about the status of the flight. The flight was delayed 4 times.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

Delays to take off and to leave the plane after landing added a lot of time to this flight.

The Phildalphia to Allentown portion was a BUS, not a plane. All was as expected.

Excellent - explanations were clear staff was nice and flight was comfortable

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

Did not get the seat I selected and paid for.

Plane was delayed for 6 hours, at first by weather, which is understandable, but was further delayed with NO given reason for 2 1/2 hours more. We had no clue when we were going to depart actually until they opened the ramp. VERY POOR to ZERO COMMUNICATION!!!

Everything you need to know for your flight from Philadelphia to Santa Rosa

Information on your arrival and departure airports

Philadelphia (PHL)
Santa Rosa (STS)