Frontier Airlines PHX Terminal  operating out of Phoenix Sky Harbor International Airport's Terminal 3 is Frontier Airlines (PHX). This terminal is renowned for its cutting-edge features and well-organized design, which make it practical for passengers. Domestic flights are offered by Frontier, with an emphasis on low-cost options. Before their flights, passengers have access to a variety of dining and retail options as well as cozy waiting lounges. The terminal has friendly workers to answer any questions and excellent signs. Terminal 3, which emphasizes price and customer service, is an excellent place to begin your journey with Frontier Airlines.