The calculated distance (air line) between Kralupy nad Vltavou and Prostějov is approximately 136 miles respectively 218 kilometers.
By car or train, the actual journey to Prostějov is certainly longer, as only the direct route (as the crow flies) between Kralupy nad Vltavou and Prostějov has been calculated here.
Air line (approximately)
218 kilometers
118 nautical miles