The calculated distance (air line) between Rychnov nad Kněžnou and Znojmo is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Znojmo is certainly longer, as only the direct route (as the crow flies) between Rychnov nad Kněžnou and Znojmo has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles