The calculated distance (air line) between Mikulov and Jablonec nad Nisou is approximately 148 miles respectively 238 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 Mikulov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
238 kilometers
128 nautical miles