The calculated distance (air line) between Mali Lošinj and Slavonski Brod is approximately 179 miles respectively 288 kilometers.
By car or train, the actual journey to Slavonski Brod is certainly longer, as only the direct route (as the crow flies) between Mali Lošinj and Slavonski Brod has been calculated here.
Air line (approximately)
288 kilometers
156 nautical miles