Interstate 8 | Interstate 10 | Interstate 15 | Interstate 17 | Interstate 19 | Interstate 40
U.S. Route 60 | U.S. Route 64 | U.S. Route 70 | U.S. Route 89 | U.S. Route 66
U.S. Route 91 | U.S. Route 93 | U.S. Route 95 | U.S. Route 160 | U.S. Route 163
U.S. Route 180 | U.S. Route 191 | U.S. Route 466 | U.S. Route 491
Main interstate routes include Interstate 17, and Interstate 19 running north-south, Interstate 40, Interstate 8, and Interstate 10 running east-west, and a short stretch of Interstate 15 running northeast/southwest through the extreme northwestern corner of the state. In addition, the various urban areas are served by complex networks of state routes and highways, such as the Loop 101, which is part of Phoenix's vast freeway system.
The Phoenix and Tucson metropolitan areas are served by public bus transit systems. Yuma and Flagstaff also have public bus systems. Greyhound Lines serves Phoenix, Tucson, Flagstaff, Yuma, and several smaller communities statewide.
A light rail system called Valley Metro Rail has recently been completed in Phoenix; it connects Central Phoenix with the nearby cities of Mesa and Tempe. The system officially opened for service in December 2008.
In May 2006, voters in Tucson approved a Regional Transportation Plan (a comprehensive bus transit/streetcar/roadway improvement program), and its funding via a new half-cent sales tax increment. The centerpiece of the plan is a light rail streetcar system (possibly similar to the Portland Streetcar in Oregon) that will travel through the downtown area, connecting the main University of Arizona campus with the Rio Nuevo master plan area on the western edge of downtown.
Airports with regularly scheduled commercial flights include: Phoenix Sky Harbor International Airport (IATA: PHX, ICAO: KPHX) in Phoenix (the largest airport and the major international airport in the state); Tucson International Airport (IATA: TUS, ICAO: KTUS) in Tucson; Phoenix-Mesa Gateway Airport (IATA: AZA, ICAO: KIWA) in Mesa; Yuma International Airport (IATA: NYL, ICAO: KNYL) in Yuma; Prescott Municipal Airport (PRC) in Prescott; Flagstaff Pulliam Airport (IATA: FLG, ICAO: KFLG) in Flagstaff, and Grand Canyon National Park Airport (IATA: GCN, ICAO: KGCN, FAA: GCN), a small, but busy, single-runway facility providing tourist flights, mostly from Las Vegas. Phoenix Sky Harbor is currently 7th busiest airport in the world in terms of aircraft movements, and 17th for passenger traffic.
Other significant airports without regularly scheduled commercial flights include Scottsdale Municipal Airport (IATA: SCF, ICAO: KSDL) in Scottsdale, and Deer Valley Airport (IATA: DVT, ICAO: KDVT, FAA: DVT) home to two flight training academies and the Nation's busiest general aviation airport.