Close to the Speed of Sound
At any time, the President must be prepared to travel anywhere on the globe. As a result, Air Force One can travel at speeds approaching those of sound. The Air Force One’s normal cruising speed is 580 miles per hour. It can also fly quite high, reaching a maximum altitude of 45,100 feet, much higher than commercial aircraft.
Source: YouTube
The plane must be able to travel quickly so that when allies request a meeting, the President can reach practically any country in a matter of hours. And, of course, outrun hostile planes at breakneck speed.