If you're asking which terminal is Frontier at PHX , the answer is Terminal 3 at Phoenix Sky Harbor International Airport. Frontier Airlines operates from Terminal 3, also known as the John S. McCain III Terminal, which offers a smooth and efficient experience for travelers. This terminal features self-service check-in kiosks, TSA PreCheck lanes, comfortable seating, and various dining and shopping options. Whether you're flying to Las Vegas, Denver, or other domestic destinations, knowing Frontier's terminal at PHX helps ensure a stress-free start to your journey. Always double-check your flight details for the most up-to-date terminal and gate information before arriving at the airport