Cheap flights from San Antonio to Philadelphia from $128

The cheapest month to fly to Philadelphia from San Antonio is in April. Flight prices, which tend to average around $341, are often lower during this time because this is during the off-season. The month of October is another great option to travel to Philadelphia, with average flight prices from San Antonio averaging around $388.

The cheapest day to depart from San Antonio to Philadelphia is on a Tuesday. Travelers who choose to depart for Philadelphia on a Tuesday will often find tickets for as low as $442. On the other hand, Monday is the most expensive day to depart from San Antonio because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,035.

According to our data, the cheapest time of day to fly to Philadelphia is in the morning. momondo users have found flights departing from San Antonio to Philadelphia in the morning for as low as $495. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is at noon when prices are around $1,190.

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

You are more likely to see cheaper flights to Philadelphia from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from San Antonio for as low as $302 on momondo.

There are 4 cabin classes available to choose from on San Antonio to Philadelphia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier and Southwest are the most popular carriers operating from San Antonio to Philadelphia

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Philadelphia from San Antonio according to our data. United Airlines is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 6 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

Dallas (DFW) was the most common stop: 18% of momondo users choosing 1-stop flights on this route connected there.

Flights via Washington, D.C. (IAD) offer the lowest average round-trip price of $218.

Flights connecting via St. Louis (STL) have the shortest average one-way travel time: 5h 10m.

St. Louis (STL) has the shortest average layover time for this route: 0h 50m.

The number of flights available between San Antonio and Philadelphia is 1 per day as of August 2026. The most frequent departure time is 7:00AM, with 100% of daily flights leaving at noon.

As of August 2026, 10 flights take off from San Antonio and land in Philadelphia each week. The most common flight departure day for this route is Mon, with 20% of weekly flights taking off on this day.