The calculated distance (air line) between Korsun-Shevchenkivskyy and Kaniv is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Kaniv is certainly longer, as only the direct route (as the crow flies) between Korsun-Shevchenkivskyy and Kaniv has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles