The highest altitude an average helicopter can fly depends on several factors, including its design, engine power, and weight. However, most helicopters typically have a service ceiling of around 10,000 to 20,000 feet (3,000 to 6,000 meters) above sea level. Some specialized helicopters, such as those used for high-altitude operations or in mountainous regions, may have higher service ceilings.
It's important to note that the performance of helicopters can be affected by various factors, including temperature, air density, and payload. Higher altitudes typically have lower air density, which reduces the helicopter's lift capability. Consequently, as the altitude increases, the helicopter's performance and maneuverability decrease.