For a standard 3-degree ILS approach, the descent rate is 318 ft per nautical mile. With a ground speed of 150 knots, that would be about 750 ft/minute. At high

For a standard 3-degree ILS approach, the descent rate is 318 ft per nautical mile. With a ground speed of 150 knots, that would be about 750 ft/minute. At higher altitudes and before the ILS, descent rates are usually higher, sometimes up to 3'000 or 4'000 ft with a default rate of 1'500 ft per minute.