The calculated distance (air line) between Znamyanka Druha and Mykolayiv is approximately 123 miles respectively 198 kilometers.
By car or train, the actual journey to Mykolayiv is certainly longer, as only the direct route (as the crow flies) between Znamyanka Druha and Mykolayiv has been calculated here.
Air line (approximately)
198 kilometers
107 nautical miles