The calculated distance (air line) between Český Krumlov and Jablonec nad Nisou is approximately 138 miles respectively 221 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 Český Krumlov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
221 kilometers
120 nautical miles