The calculated distance (air line) between L'Haÿ-les-Roses and Metz is approximately 176 miles respectively 283 kilometers.
By car or train, the actual journey to Metz is certainly longer, as only the direct route (as the crow flies) between L'Haÿ-les-Roses and Metz has been calculated here.
Air line (approximately)
283 kilometers
152 nautical miles