Southwest Airlines operates out of Terminal D at Philadelphia International Airport. Terminal D is the primary terminal for all domestic flights at PHL and is well-equipped with a variety of dining options, shops, and passenger services to ensure a comfortable travel experience. If you're wondering what terminal is Southwest at PHL, rest assured that all Southwest flights arrive and depart from Terminal D. This terminal offers easy access to ground transportation, rental car services, and parking facilities, making it convenient for travelers flying with Southwest Airlines at Philadelphia International Airport. Whether you are catching a domestic flight or connecting to another destination, Terminal D provides a streamlined and passenger-friendly environment tailored to Southwest’s operations.