The ultra-low-cost carrier Frontier Airlines has been expanding at Phoenix Sky Harbor International Airport in recent years.

Heading to the north Valley or to Sky Harbor Airport this weekend? Be on the lookout for these closures that will affect your drive time. For drivers in north Phoenix and others coming back from the ...

via Sky Harbor. Phoenix is one of four new cities Frontier added out of Austin Bergstrom International Airport. Nonstop flights to Austin will begin March 7, coinciding with the start of the South ...