The calculated distance (air line) between Čačak and Sremska Mitrovica is approximately 83 miles respectively 134 kilometers.
By car or train, the actual journey to Sremska Mitrovica is certainly longer, as only the direct route (as the crow flies) between Čačak and Sremska Mitrovica has been calculated here.
Air line (approximately)
134 kilometers
72 nautical miles