Cheap flights from Philadelphia to San Diego from $159

If you are unable to visit San Diego during the month of February, then departing from Philadelphia during the month January is also very affordable. Most momondo users find prices during this month for around $431.

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 $480. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $624. 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 evening when flights can be purchased for as low as $453. Flights in the morning are often more expensive with an average ticket price of $531.

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 $503 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 $448 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.

Southwest is the most popular carrier operating from Philadelphia to San Diego

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to San Diego from Philadelphia according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 7 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: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Boston (BOS) offer the lowest average round-trip price of $265.

Flights connecting via Boston (BOS) have the shortest average one-way travel time: 10h 47m.

Boston (BOS) has the shortest average layover time for this route: 2h 01m.

As of October 2026, 1 flights take off from Philadelphia and land in San Diego each day. The most common flight departure time for this route is 6:00PM, with 58% of daily flights taking off in the evening.

The number of flights available between Philadelphia and San Diego is 7 per week as of October 2026. The most frequent departure day is Mon, with 71% of weekly flights leaving on this day.