Frontier Airlines PHX Terminal  at Phoenix Sky Harbor International Airport (PHX) is where Frontier Airlines is based. The airline is well-known for providing affordable local and limited foreign flights. Travelers will find Terminal 3 to be a convenient modern facility with a wide range of restaurants and shopping opportunities. Gates, self-service kiosks, and check-in booths are easily accessible to travelers flying with Frontier. Arriving early is advised because security queues might vary in length. Although Frontier does not give first-rate amenities, it offers effective service to people looking for inexpensive travel options.