Spirit Airlines PHX Terminal , Spirit Airlines operates out of Terminal 4 at Phoenix Sky Harbor International Airport (PHX). This terminal is conveniently located with easy access to numerous amenities, including dining options, shopping, and lounges. Travelers flying with Spirit can check in at their designated counters in Terminal 4. The airport provides clear signage to guide passengers to their gates, and Spirit Airlines staff are available to assist with any needs or questions. For a smoother experience, passengers are encouraged to arrive early, especially during peak travel times, to complete check-in and security procedures.