What Terminal is Frontier Airlines at IAH? Frontier Airlines operates out of Terminal A at George Bush Intercontinental Airport (IAH) in Houston. Terminal A primarily handles domestic flights and is well-equipped with a variety of amenities, including dining options, retail stores, and comfortable seating areas. Passengers flying with Frontier Airlines can benefit from efficient check-in procedures and convenient access to security checkpoints, ensuring a smooth and hassle-free travel experience. Terminal A's modern facilities cater to the needs of all travelers, making it easy for Frontier Airlines passengers to navigate and enjoy their time at IAH.