The calculated distance (air line) between Týnec nad Sázavou and Třinec is approximately 182 miles respectively 294 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Týnec nad Sázavou and Třinec has been calculated here.
Air line (approximately)
294 kilometers
158 nautical miles