The calculated distance (air line) between Montigny-lès-Metz and Uckange is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Uckange is certainly longer, as only the direct route (as the crow flies) between Montigny-lès-Metz and Uckange has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles