The calculated distance (air line) between Montigny-lès-Metz and Dudelange is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Dudelange is certainly longer, as only the direct route (as the crow flies) between Montigny-lès-Metz and Dudelange has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles