The speed at which a plane flies can vary depending on several factors, including the type of plane, its purpose, and the phase of flight. Commercial airliners generally have cruising speeds that range from around 800 kilometers per hour (km/h) to 1,000 km/h. This is equivalent to approximately 500 to 600 miles per hour (mph). However, there are also planes designed for different purposes that can fly at much higher speeds.
For example, supersonic passenger jets, such as the retired Concorde, were capable of flying at speeds exceeding 2,000 km/h (1,200 mph). Military aircraft, such as fighter jets, can reach even higher speeds, with some capable of flying at supersonic or hypersonic speeds.
It's important to note that these speeds are approximate and can vary depending on the specific aircraft, weather conditions, and other factors that may affect flight performance.