What terminal is Frontier Airlines at PHL refers to the specific terminal at Philadelphia International Airport (PHL) where Frontier Airlines operates. The answer to this question is that Frontier Airlines is located at Terminal E. When traveling with Frontier Airlines at PHL, passengers should head to Terminal E for check-in, security, boarding, and other services. Knowin the what te... https://airlineofficedetails.com/frontier-airlines-philadelphia-airport-terminal-phil/