The calculated distance (air line) between Klášterec nad Ohří and Znojmo is approximately 166 miles respectively 268 kilometers.
By car or train, the actual journey to Znojmo is certainly longer, as only the direct route (as the crow flies) between Klášterec nad Ohří and Znojmo has been calculated here.
Air line (approximately)
268 kilometers
144 nautical miles