The calculated distance (air line) between Bystřice nad Pernštejnem and Třinec is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Bystřice nad Pernštejnem and Třinec has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles