The calculated distance (air line) between Saint-Mandé and L'Haÿ-les-Roses is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to L'Haÿ-les-Roses is certainly longer, as only the direct route (as the crow flies) between Saint-Mandé and L'Haÿ-les-Roses has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles