The calculated distance (air line) between Ústí nad Orlicí and Třinec is approximately 104 miles respectively 167 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Ústí nad Orlicí and Třinec has been calculated here.
Air line (approximately)
167 kilometers
90 nautical miles