The calculated distance (air line) between Marseille 13 and Plan-de-Cuques is approximately 3 miles respectively 6 kilometers.
By car or train, the actual journey to Plan-de-Cuques is certainly longer, as only the direct route (as the crow flies) between Marseille 13 and Plan-de-Cuques has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles