The calculated distance (air line) between Dvůr Králové nad Labem and Třinec is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Dvůr Králové nad Labem and Třinec has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles