Find great value on US Airways flights from DEN to PHX when you book with CheapOair! The capital city of Arizona is an exciting place to visit. Whether you are in love with adventure, art or food, there is plenty to keep you engaged in the city. Hike to the top of Piestewa Peak and enjoy skyline views of this beautiful city. Fix a date with the Tempe Center for the Arts which hosts many exciting ballet and opera performances. Don't forget to take your kids to the Phoenix Zoo which is spread across an area of 125 acres and features rare wildlife species like galapagos tortoises and baboons.