The calculated distance (air line) between Stuttgart and Montigny-lès-Metz is approximately 139 miles respectively 224 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 Stuttgart and Montigny-lès-Metz has been calculated here.
Air line (approximately)
224 kilometers
121 nautical miles