The calculated distance (air line) between Nymburk and Jablonec nad Nisou is approximately 38 miles respectively 61 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 Nymburk and Jablonec nad Nisou has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles