Southwest Airlines primarily operates out of Terminal 4 at Phoenix Sky Harbor International Airport. Terminal 4 is the largest terminal at the airport and serves both domestic and international flights. It houses a significant number of gates dedicated to Southwest Airlines, allowing for easy access and convenience for Southwest passengers. Terminal 4 offers a range of amenities, including restaurants, shops, and passenger services to enhance the travel experience. Phoenix Sky Harbor International Airport is located about three miles southeast of downtown Phoenix, making it easily accessible for travelers heading to and from the city. Passengers flying with Southwest can expect to find their flights departing from Terminal 4.