The calculated distance (air line) between Gagny and Paris 17 Batignolles-Monceau is approximately 10 miles respectively 15 kilometers.
By car or train, the actual journey to Paris 17 Batignolles-Monceau is certainly longer, as only the direct route (as the crow flies) between Gagny and Paris 17 Batignolles-Monceau has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles