United Airlines operates a major hub at Denver International Airport (DEN), utilizing Concourse B. United Airlines DEN Terminal is a bustling hub for both domestic and international flights, offering a range of services for travelers. Passengers can access numerous United Club lounges for relaxation, as well as a wide selection of dining and shopping options. United's presence at DEN is significant, serving as a connecting point for flights across the United States and globally. The concourse is well-equipped with modern amenities, easy access to ground transportation, and clear signage to ensure a smooth travel experience.