The calculated distance (air line) between Kostelec nad Orlicí and Prostějov is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Prostějov is certainly longer, as only the direct route (as the crow flies) between Kostelec nad Orlicí and Prostějov has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles