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It could reach a top speed of 4,520 miles per hour (7,274 km/h), or Mach 6.72. During the X-15 program, 13 flights by eight pilots met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts.
While the true top-speed of the F-22 is classified and secret, it can go faster than Mach 2.25 (2390 km/h 1485 mph) with afterburners. What's more important is that it can super-cruise at Mach 1.82 (1932 km/h 1043mph).