Frontier Airlines is based out of Terminal E of Philadelphia International Airport (PHL). It is commonly known that Frontier provides affordable domestic flights to popular destinations in the United States. The Frontier Airlines PHL Terminal offers a variety of amenities, including restaurants, shops, and comfortable seating areas for passengers. It can be easier to get through security if you arrive early because Terminal E can get packed. Frontier’s check-in counters and gates are conveniently located, making it easy for travelers to board and enjoy their journey.