Frontier airlines airport has four terminals according to the direction - North, West, Southend east. While the frontier airlines Denver terminal is East. the terminals are further connected with concourses. That is A, BAnd c and that includes 138 gates. The terminals are the direction in which the airport is located. Frontiers airlines at Denver is located under the east terminal. There are 4 terminals while they all are divided into 3 concourses which have more than 120 gates.