Frontier Airlines STL Terminal+1–888–839–0502 Operating out of Terminal 2 at St. Louis Lambert International Airport Frontier Airlines STL Terminal provides a quick and easy way to get around. With standard services like check-in kiosks, TSA security checks, cafeteria options, free Wi-Fi, and charging stations, Terminal 2 serves low-cost carriers. Because of its small size, the terminal is easy to navigate and has minimal walking distances to the gates. It is recommended that passengers flying with Frontier Airlines arrive at least two hours prior to departure in order to ensure a seamless check-in and boarding procedure. visit us :......See More