The calculated distance (air line) between Vinkovci and Sremska Mitrovica is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Sremska Mitrovica is certainly longer, as only the direct route (as the crow flies) between Vinkovci and Sremska Mitrovica has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles