The calculated distance (air line) between Nové Město na Moravě and Třinec is approximately 117 miles respectively 187 kilometers.
By car or train, the actual journey to Třinec is certainly longer, as only the direct route (as the crow flies) between Nové Město na Moravě and Třinec has been calculated here.
Air line (approximately)
187 kilometers
101 nautical miles