The calculated distance (air line) between Cologne and Redange-sur-Attert is approximately 93 miles respectively 150 kilometers.
By car or train, the actual journey to Redange-sur-Attert is certainly longer, as only the direct route (as the crow flies) between Cologne and Redange-sur-Attert has been calculated here.
Air line (approximately)
150 kilometers
81 nautical miles