How fast can a prop plane go?

Propeller-driven planes, or prop planes, typically have cruising speeds ranging from about 100 to 300 knots (115 to 345 mph or 185 to 555 km/h), depending on the specific aircraft type and design. Smaller general aviation prop planes usually fly at lower speeds, while larger turboprop aircraft can reach higher speeds. For example, a common turboprop like the Beechcraft King Air can cruise around 200 knots (230 mph or 370 km/h). Overall, the speed can vary significantly based on the aircraft's size, engine power, and intended use.