How fast are F-16?

Answer 1

Mach 2. But that in mph varies from altitude. Now if you had asked how fast is Mach 2 in the standard atmosphere at sea level, the answer could be found by simply looking up the speed of sound at sea level in a standard atmospheric table and multiplying it by two. Since the speed of sound through the standard atmosphere is 761 mph (1,223 km/h) at sea level, Mach 2 then follows as 1,522 mph (2,447 km/h). If you were to ask how fast is Mach 2 at an altitude of 30,000 ft (9,150 m), we would use the same methodology to find out that it is only 1,356 mph (2,180 km/h) because the speed of sound generally decreases as altitude increases.
At altitude an F-16 can hit maximum speeds of 1,500 mph / 2,410 Km/h
At sea level, the F-16 can go Mach 1.2 (915 mph). At altitude it can go: Mach 2+ (1,500 mph)