Frontier Airlines operates out of Terminal E at Philadelphia International Airport. This terminal is designed to handle domestic travel efficiently, with a straightforward layout and clearly marked signage to help you navigate with ease. Upon entering Terminal E, you’ll find the Frontier check-in counters near the entrance, followed by TSA security checkpoints that lead into the departure gates. visit - https://airportsterminalhub.com/airlines/frontier-airlines/frontier-airlines-philadelphia-international-airport-phl-terminal/