The calculated distance (air line) between Kovačica and Sremska Mitrovica is approximately 50 miles respectively 81 kilometers.
By car or train, the actual journey to Sremska Mitrovica is certainly longer, as only the direct route (as the crow flies) between Kovačica and Sremska Mitrovica has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles