United Airlines DEN Terminal operations at Denver International Airport (DEN) are centered in Concourse B, which serves as one of the airline’s largest and most important hubs. Handling a vast number of domestic and international flights, Concourse B is a modern, spacious terminal designed to facilitate smooth passenger flow and ensure an efficient travel experience. As a key gateway for travelers connecting to destinations across the United States and beyond, United’s hub at DEN is equipped with state-of-the-art facilities, including self-service kiosks, baggage drop stations, and TSA PreCheck lanes for faster security screening.