what terminal is Frontier airlines at DEN operations are concentrated in Terminal 1 at Denver International Airport, where Concourse A is designated for the airline. This terminal's modern architecture allows for high passenger volumes while remaining efficient and comfortable. Concourse A has a variety of amenities, including fast food and more substantial meal alternatives. Retail businesses in the terminal sell everything from convenience items to local products. The terminal has large lounging spaces with several charging outlets and high-speed Wi-Fi. The layout is straightforward, with clear signage and interactive information displays to assist visitors in navigating between gates and other amenities. Terminal 1 is designed to enhance the travel experience with a focus on convenience and passenger comfort.