The calculated distance (air line) between Korsun-Shevchenkivskyy and Smila is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Smila is certainly longer, as only the direct route (as the crow flies) between Korsun-Shevchenkivskyy and Smila has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles