what terminal is Frontier Airlines at MCO refers to the common question travelers have when flying from Orlando International Airport (MCO). The answer to what terminal is Frontier Airlines at MCO is that Frontier Airlines operates from Terminal A at Orlando International Airport. Passengers flying with Frontier Airlines will check in, pass through security, and board their flights at this terminal. Knowing the correct terminal is essential for a smooth travel experience, as it helps passengers navigate the airport more efficiently and ensures they arrive at the right gate for their Frontier Airlines flight.