The calculated distance (air line) between Redange-sur-Attert and Diekirch is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Diekirch is certainly longer, as only the direct route (as the crow flies) between Redange-sur-Attert and Diekirch has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles