The calculated distance (air line) between Jirkov and Jablonec nad Nisou is approximately 77 miles respectively 124 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 Jirkov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
124 kilometers
67 nautical miles