Frontier Airlines PHX Terminal Essential services including baggage claim, security screening, and check-in counters are available at the terminal. For ticketing and check-in, travelers on Frontier flights should proceed to Terminal 3's lower level. In addition, the terminal has a number of restaurants, shops, and cozy seating sections. In order to allow for check-in, security, and other required processes, travelers are advised to arrive at least two hours prior to their planned departure. Check the websites of the airport and Frontier for the most recent information on gate changes or flight status.