Cheap flights from Philadelphia to San Diego from $64

If you are unable to visit San Diego during the month of September, then departing from Philadelphia during the month May is also very affordable. Most momondo users find prices during this month for around $405.

The cheapest day to depart from Philadelphia to San Diego is on a Tuesday. Travelers who choose to depart for San Diego on a Tuesday will often find tickets for as low as $391. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $560. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $423. Flights in the morning are often more expensive with an average ticket price of $460.

Fly from Philadelphia to San Diego for the best Philadelphia - San Diego flight prices

You are more likely to see cheaper flights to San Diego from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $427 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Philadelphia for as low as $379 on momondo.

There are 3 cabin classes available to choose from on Philadelphia to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 4% on your flight if you consider stops on a Philadelphia to San Diego flight.

As of February 2026, prices for Philadelphia to San Diego flights are approximately 15% cheaper when compared to flights at the same time last year.

Frontier and Alaska Airlines are the most popular carriers operating from Philadelphia to San Diego

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to San Diego from Philadelphia according to our data. American Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 9 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Denver (DEN) was the most common stop: 38% of momondo users choosing 1-stop flights on this route connected there.

Flights via Las Vegas (LAS) offer the lowest average round-trip price of $155.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 7h 28m.

Detroit (DTW) has the shortest average layover time for this route: 1h 00m.

As of February 2026, 6 flights take off from Philadelphia and land in San Diego each day. The most common flight departure time for this route is 4:00PM, with 46% of daily flights taking off in the afternoon.

The number of flights available between Philadelphia and San Diego is 48 per week as of February 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.