American offers direct flights to Philadelphia from 118 cities. The most frequent departures are: Chicago, Dallas, Boston, Los Angeles and Charlotte.

Frontier offers direct flights to Philadelphia from 30 cities. The most frequent departures are: Orlando, Atlanta, San Juan, Tampa and Denver.

Spirit offers direct flights to Philadelphia from 12 cities. The most frequent departures are: Orlando, Fort Lauderdale, Punta Cana, Miami and San Juan.

Southwest offers direct flights to Philadelphia from 7 cities. The most frequent departures are: Chicago, Denver, Nashville, St. Louis and Orlando.

United offers direct flights to Philadelphia from 5 cities. The most frequent departures are: Chicago, Washington, Denver, Houston and San Francisco.

Delta offers direct flights to Philadelphia from 5 cities. The most frequent departures are: Atlanta, Detroit, Minneapolis, Boston and Salt Lake City.