The calculated distance (air line) between Jičín and Jablonec nad Nisou is approximately 21 miles respectively 34 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 Jičín and Jablonec nad Nisou has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles