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Cruising speed is 585 mph. The max speed for a 747-8 is 614mph, or 988km/h.
Maximum speed = 0.92 mach
I recently watched a YouTube

video of a Boeing 747 that reached a ground speed of 744 MPH (1196 km/hr). This is the highest speed that I know of that a 747 has ever flew. Here's the link to the video if you want to watch it. http:

//www.youtube.comwatch?v=AHrsYKTnGAU

It's titled "Boeing 747 Fastest Speed Commercial Flight".


0.85 Mach

567 mph (913 km/h)

AnswerThe Boeing 747 cruises at around 0.85 Mach, but in answer to how fast "can" one go, the answer is that Vmo/Mmo (maximum operating speed/mach) for the earlier versions is 0.89 Mach and for the 747-400 it's 0.92 Mach.
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