At cruise altitude (35,000ft) the average cruise speed is 460 knots - 530mph.
Its top speed, according to Boeing, is 609 mph
from wikipediaCruise speed Mach 0.80 (530 mph, 458 knots, 850 km/h at cruise altitude, i.e. 35,000 ft or 10.66 km)
it is commonly 140 mph on average
Mach 0.80 (530 mph or 458 knots) at 35,000 ft.
Mach 0.855 (650 mph) - The Boeing 747-8 (launch late 2009) and the Boeing 777.
I just flew from MI to AK on a Boeing 757-300. While we were on the Tarmac I occupied myself by reading the safety literature that is found in the pocket of the seat back in front of you. In it they had all of the 757 series planes and the average speed was 528 MPH
depends on the jet, a Boeing 747-400 has a top speed of 614 mph at 35,000 feet
528 mph
Boeing 747-400 0.86=654.632 Boeing 787 0.85 =647.020 Boeing 777 0.84=639.408 Boeing 767 0.80=608.960 Boeing 757 0.80=608.960 Boeing 737 -800 0.78=593.736 Boeing 737 - 300/400/500 0.74 =654.632 Airbus 380 0.85=647.020 Airbus 340 -300/600 0.82 Airbus 330 0.82=624.184 Airbus 320 0.78=593.736 Airbus 310 0.78=593.736 McDonnell MD-11 0.85=647.020 Speeds shown are in mach and then equivalent in MPH - Mach 1.0 is equivalent to the speed of sound. mach 1 =761.200
The max. speed of the Boeing 777 is 590 mph.
The top speed of a Boeing 787 is about 593 mph.
It depends on which jet. Many jet fighters can fly in excess of mach 2 or about 1,500 mph.