The calculated distance (air line) between Aix-en-Provence and Plan-de-Cuques is approximately 13 miles respectively 20 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 Aix-en-Provence and Plan-de-Cuques has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles