The calculated distance (air line) between Rychnov nad Kněžnou and Děčín is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Děčín is certainly longer, as only the direct route (as the crow flies) between Rychnov nad Kněžnou and Děčín has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles