Southwest Airlines PHX Terminal+1-888-839-0502 The main base of operations for Southwest Airlines PHX Terminal Sky Harbor International Airport's Terminal 4 (PHX). The busiest and most advanced terminal at PHX is Terminal 4, which provides Southwest travelers with a smooth journey. It offers a variety of dining and shopping alternatives to improve your trip, as well as easy check-in desks and quick security checks. visit us : https://www.terminalsme.com/southwest-airlines/southwest-airlines-phx-terminal-phoenix-sky-harbor-international-airport/