The calculated distance (air line) between Frenštát pod Radhoštěm and Znojmo is approximately 109 miles respectively 175 kilometers.
By car or train, the actual journey to Znojmo is certainly longer, as only the direct route (as the crow flies) between Frenštát pod Radhoštěm and Znojmo has been calculated here.
Air line (approximately)
175 kilometers
94 nautical miles