How fast do military jets fly?

The aircraft can reach a maximum supersonic speed of Mach 2.35 (1,550 mph, or 2,500 km/h), which is 2.35 times the speed of sound. The Su-27 earned a reputation of being one of the most capable fighters of its time, and some remain in military use in Russia, Belarus and the Ukraine. read more

Fifth-generation fighter jets, those that went into production after 2005, are actually considerably slower than many jets from the 1960s and 1970s. Eight of the 10 fastest air crafts on record were developed before 1965, and the fastest jet in the world, the X-15, was first flown in 1959 and retired in 1970. read more

This jet was a Soviet machine built to intercept American aircraft during the cold war like the SR-71 and high- slow flying surveillance aircraft. Since it was built to intercept the SR-71 it was required to have an extreme speed, hence its mach 3.2 top capability. read more