$245 Cheap American Airlines flights Philadelphia (PHL) to Santa Rosa (STS)

Apply the “Price (lowest to highest)” filter on Expedia to look for cheap American Airlines round-trip flights from $465 from PHL to STS. Affordable one-way options from $245 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

American Airlines flights to Santa Rosa are typically cheaper in the low-season months of January and February. Whether you’re in search of a return or one-way ticket, you could score a better deal then.

Search for cheap American Airlines flights from Philadelphia Intl. Airport (PHL) to Sonoma County Airport (STS) one to three months ahead of your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and itinerary, the best day of the week to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Fill in your dates, click search and use the “Nonstop” filter on Expedia to find any direct flights from PHL to STS with American Airlines or other airlines.

Browse American Airlines’s earliest flights from PHL to STS by selecting the “Early Morning” and “Morning” filters. Not only will you arrive sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Sonoma County Airport (STS) is the main Santa Rosa hub for American Airlines flights from Philadelphia Intl. Airport (PHL).

Depending on the type of ticket you purchased, a fee typically applies if you cancel or change your flight more than 24 hours after it’s confirmed. To secure tickets with more flexibility, select our “Changes included” and “No cancel fee” boxes when you look for flights. For more details on modifying or canceling your reservation, visit “Trips,” select your flight and click on “Manage Booking.”