typical speed of an airplane
At altitude, an aircraft could be flying 300 knots indicated air speed, but have a ground speed of 500 knots. To covert knots to km/h, multiply the speed in knots by 1.85. I fly all the time with an 500 knot ground speed, which translates to 925 km/h.t altitude, an aircraft could be flying 300 knots indicated air speed, but have a ground speed of 500 knots. To covert knots to km/h, multiply the speed in knots by 1.85. I fly all the time with an 500 knot ground speed, which translates to 925 km/h.