United Airlines offers hassle-free travels from Terminal 3 at Phoenix Sky Harbor International Airport (PHX). For travelers, this terminal offers convenient check-in either at United Airlines PHX Terminal kiosks or counters and TSA PreCheck for more efficient security screenings. The terminals offer a lot of dining and shopping options that can make the wait time less tedious. United offers comfortable seats, preboarding of eligible passengers, and attentive staff, all ready to help make a smoother beginning to your trip out of Phoenix.