The calculated distance (air line) between Trutnov and Jablonec nad Nisou is approximately 34 miles respectively 55 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 Trutnov and Jablonec nad Nisou has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles