Frontier Airlines operates out of Terminal 3 at Harry Reid International Airport (LAS), formerly known as McCarran International Airport. Terminal 3 is the newer of the two main terminals at LAS and is known for its modern design and wide range of amenities. The terminal is well-organized, with clear signage and streamlined services. Frontier check-in counters are typically located near the central area of Terminal 3’s departures level. Once you check in and pass through security, you’ll head to the D Gates, which serve many domestic and international flights.