What Terminal is Southwest Airlines at DEN? Southwest Airlines operates from Terminal East at Denver International Airport. This terminal offers passengers a smooth and efficient travel experience with quick check-in services, TSA security checkpoints, baggage claim, and a wide selection of dining and shopping options. Terminal East is designed for convenience, making it easy for travelers to navigate and access all necessary amenities. Whether you're flying for business or leisure, Southwest Airlines at DEN provides reliable service and a traveler-friendly environment.