Philadelphia International Airport, 7 miles south of Center City, is served by direct flights from Europe, the Caribbean, Mexico and Canada and offers connections to Asia, Africa and South America. Domestically, it has flights to over 100 destinations in the USA.
Greyhound and Peter Pan Bus Lines are the major bus carriers. A return fare to New York City is about $42 (2½ hours one way), to Atlantic City $18 (1½ hours) and to Washington, DC, $43 (3½ hours). Capitol Trailways makes connections to Lancaster, Reading, New York City, and Washington, DC. NJ Transit carries you from Philly to points in New Jersey.
Beautiful 30th St Station is one of the biggest train hubs in the country. Amtrak provides service from here to Boston (regional and Acela express service $97 one way, 5-5¾ hours) and Pittsburgh (regional service $45, 7¼ hours). A cheaper but longer (adult/child $19/13; 2½ hours) way to get to NYC is to take the SEPTA R7 suburban train to Trenton in New Jersey. There you connect with NJ Transit to Newark’s Penn Station, then continue on NJ Transit to New York City’s Penn Station.
City information:
http://www.phila.gov/
http://www.lonelyplanet.com/usa/pennsylvania/philadelphia
http://en.wikipedia.org/wiki/Philadelphia