The calculated distance (air line) between Dačice and Jablonec nad Nisou is approximately 114 miles respectively 184 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 Dačice and Jablonec nad Nisou has been calculated here.
Air line (approximately)
184 kilometers
99 nautical miles