I-40, providing east-west coast access, runs through the center of Flagstaff. Access to the south is via I-17. U.S. routes 89 and 180 run between Flagstaff and the Grand Canyon. At Pulliam Airport, located just four miles south of downtown Flagstaff, America West Express provides hourly flights to Phoenix, where national and international connections can be made. Amtrak offers two daily trains from Flagstaff that connect with trains to Chicago and Los Angeles, and Greyhound-Trailways has interstate and intrastate bus service.
Flagstaff has developed many of the traffic congestion problems that come with rapid growth. Some estimates say that traffic has more than tripled since 1974. Two major traffic improvements are underway; one on I-40 and the other a new bridge over the railway at 4th Street and at Route 66. Shuttle and tour bus service is provided by Grayline/Nava-Hopi Tours and Mountain Line.