The calculated distance (air line) between Benešov and Jablonec nad Nisou is approximately 69 miles respectively 110 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 Benešov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
110 kilometers
60 nautical miles