The calculated distance (air line) between Rumburk and Jablonec nad Nisou is approximately 31 miles respectively 50 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 Rumburk and Jablonec nad Nisou has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles