$105 Cheap Frontier Airlines flights Philadelphia (PHL) to San Diego (SAN)

You can discover affordable return Frontier Airlines flights from $192 from PHL to SAN by filtering your results from “Price (lowest to highest)” on Expedia. Or look for bargains from $105 for a one-way journey.**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.

January is one of the cheapest months to fly to San Diego with Frontier Airlines. You could also find great prices on one-way and return tickets in November.

Start searching one to three months ahead of your travel date to find cheaper fares on Frontier Airlines flights from Philadelphia Intl. Airport (PHL) to San Diego Intl. Airport (SAN). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic flights.*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, hit search and tick the “Nonstop” filter on Expedia to browse any direct flights from PHL to SAN with Frontier Airlines or another carrier.

Sort your results by “Early Morning” and “Morning” to find the earliest flights from PHL to SAN. Setting off early means you’re 20% less likely to experience cancellations.**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.

Frontier Airlines flights from Philadelphia Intl. Airport (PHL) to San Diego touch down at San Diego Intl. Airport (SAN). This is the main entry point to this city.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to travel from PHL to SAN with Frontier Airlines. Plus, when you sign up to our One Key™ program, you can earn OneKeyCash™* alongside any airline loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee typically applies if you cancel or reschedule your flight more than 24 hours after confirmation. To secure flexible fares, select our “No cancel fee” or “Changes included” filter when searching for flights. To learn more about changing or canceling your reservation, head to “Trips,” select your flight and click on “Manage Booking.”