The calculated distance (air line) between Klášterec nad Ohří and Prostějov is approximately 186 miles respectively 299 kilometers.
By car or train, the actual journey to Prostějov is certainly longer, as only the direct route (as the crow flies) between Klášterec nad Ohří and Prostějov has been calculated here.
Air line (approximately)
299 kilometers
161 nautical miles