The calculated distance (air line) between Issy-les-Moulineaux and Montrouge is approximately 2 miles respectively 3 kilometers.
By car or train, the actual journey to Montrouge is certainly longer, as only the direct route (as the crow flies) between Issy-les-Moulineaux and Montrouge has been calculated here.
Air line (approximately)
3 kilometers
1 nautical miles