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Confidence votes 217. There are a great variety of commercial aircraft, so flying speeds differ. Most commercial passenger jet airliners cruise at about 480 - 560 miles per hour. The cruise speed for each aircraft may vary, depending upon the power setting the crew elects to use.
Airlines care about money. Running a plane at top speed burns more fuel - expensive fuel. Airplanes are typically flown at 8/10ths or 9/10ths as fast as they can be flown to save on fuel and probably also wear and tear on the equipment.