The calculated distance (air line) between Cologne and Montigny-lès-Metz is approximately 132 miles respectively 212 kilometers.
By car or train, the actual journey to Montigny-lès-Metz is certainly longer, as only the direct route (as the crow flies) between Cologne and Montigny-lès-Metz has been calculated here.
Air line (approximately)
212 kilometers
114 nautical miles