The calculated distance (air line) between Kryvyy Rih and Mykolayiv is approximately 92 miles respectively 148 kilometers.
By car or train, the actual journey to Mykolayiv is certainly longer, as only the direct route (as the crow flies) between Kryvyy Rih and Mykolayiv has been calculated here.
Air line (approximately)
148 kilometers
80 nautical miles