The calculated distance (air line) between Polná and Jablonec nad Nisou is approximately 89 miles respectively 143 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 Polná and Jablonec nad Nisou has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles