The calculated distance (air line) between Třešť and Jablonec nad Nisou is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Jablonec nad Nisou is certainly longer, as only the direct route (as the crow flies) between Třešť and Jablonec nad Nisou has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles