The calculated distance (air line) between Ostrov and Jablonec nad Nisou is approximately 102 miles respectively 165 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 Ostrov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
165 kilometers
89 nautical miles