What Terminal is Frontier Airlines At PHL? Frontier Airlines operates out of Terminal E at Philadelphia International Airport (PHL). This terminal is primarily used for domestic flights, providing convenience for travelers flying within the United States. Terminal E is equipped with various amenities, including dining options, shops, and comfortable seating areas, ensuring a pleasant pre-flight experience. Passengers can enjoy efficient check-in and security services, as Frontier Airlines’ counters are easily accessible within the terminal. With direct connections to numerous destinations, Terminal E ensures a smooth travel experience for Frontier Airlines customers at PHL.