Philadelphia County is one of the three original counties, along with Chester and Bucks counties, …$62 Cheap flights from Philadelphia (PHL) to Phoenix (PHX) - Expedia Flights from Philadelphia Intl. Its county seat is Philadelphia, the nation's sixth-largest city. Philadelphia County is the most populous county in Pennsylvania and the 24th-most populous county in the nation.As of the 2020 census, the county had a population of 1,603,797. American Airlines is also a great choice for the route, with an average price of $530 and an overall rating of 7.2. With an average price for the route of $283 and an overall rating of 8.1, JetBlue is the most popular choice. The two airlines most popular with KAYAK users for flights from Philadelphia to New York are JetBlue and American Airlines.
