The calculated distance (air line) between Gornji Milanovac and Sremska Mitrovica is approximately 78 miles respectively 125 kilometers.
By car or train, the actual journey to Sremska Mitrovica is certainly longer, as only the direct route (as the crow flies) between Gornji Milanovac and Sremska Mitrovica has been calculated here.
Air line (approximately)
125 kilometers
68 nautical miles