Phoenix the capital of Arizona, is located about 370 miles east of Los Angeles, and about 625 miles southeast of Hill Valley.
By 2015, Skyway C25 routed hoverconverted vehicles past Hill Valley and onward to Phoenix, Boston and London.
Behind the scenes
Monument Valley, where the Pohatchee Drive-In Theatre scenes were filmed for Back to the Future Part III is located about 340 miles east-northeast of Phoenix.
Back to the Future Part II (Mentioned only)