How do I speak to a Frontier Airline Representative? Call I855-52I-7799. Frontier Airline has an easy-to-use ticketing system, which includes online ticket reservations. The online booking process for Frontier Airline is simple and versatile. Aside from online booking, Frontier offers a few other options for flight reservations. If you are unsure about making a Frontier Airline reservation through the online booking procedure or any other route, then read the information provided below. Frontier Airline, which was established and began operations in 1994, is the US's eighth-largest commercial airline. The airline currently connects to more than 60 domestic destinations and 5 international destinations. Frontier Airline, as an ultra-low-cost carrier, entices people to book a ticket and arrive at their destination quickly and comfortably. Furthermore, Frontier Airline is a subsidiary of Indigo Partners, which owns the company entirely. If you want to book a cheap air fare