Southwest Airlines is located in Terminal 4 of Phoenix Sky Harbor International Airport, which is the busiest and most passenger-friendly terminal. Southwest Airlines passengers like quick check-in, numerous self-service kiosks, efficient TSA security lanes, and large boarding spaces. Terminal 4 also has a selection of restaurants, shops, free Wi-Fi, pet relief zones, and convenient transit. Whether you're flying for business or leisure, the Southwest Sky Harbor Terminal provides a seamless travel experience with courteous staff and modern amenities.