The calculated distance (air line) between Kaštel Kambelovac and Vukovar is approximately 179 miles respectively 289 kilometers.
By car or train, the actual journey to Vukovar is certainly longer, as only the direct route (as the crow flies) between Kaštel Kambelovac and Vukovar has been calculated here.
Air line (approximately)
289 kilometers
156 nautical miles