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What terminal is Frontier at DEN? The main base of operations for Frontier Airlines is Concourse A at Denver International Airport (DEN). DEN is a key component of Frontier's vast network, serving as its main hub and linking travelers to a wide range of local and international locations. With self-service kiosks, mobile check-in choices, and easy access to gates, the airline provides a simplified travel experience. Concourse A offers a range of facilities to improve passenger comfort, including as food options, retail stores, and charging stations. Frontier is a well-liked option for travelers on a tight budget leaving from or connecting through Denver's well-maintained terminal facilities...