Denver International Airport's Terminal A is home to Frontier Airlines DEN Terminal . Numerous domestic and foreign airlines are served by this terminal; Frontier provides inexpensive flights across the United States and abroad. Passengers flying with Frontier can check in at the airline’s designated counters or utilize self-service kiosks for faster processing. To make travel more comfortable, Terminal A offers a range of dining options, retail stores, and services. With speedy security procedures and enough seating at the gates, Terminal A is built for simplicity of use, assuring a smooth experience for travelers flying with Frontier Airlines.