The calculated distance (air line) between Ledeč nad Sázavou and Třinec is approximately 152 miles respectively 244 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Ledeč nad Sázavou and Třinec has been calculated here.
Air line (approximately)
244 kilometers
132 nautical miles