The calculated distance (air line) between Castelnau-le-Lez and Aix-en-Provence is approximately 78 miles respectively 125 kilometers.
By car or train, the actual journey to Aix-en-Provence is certainly longer, as only the direct route (as the crow flies) between Castelnau-le-Lez and Aix-en-Provence has been calculated here.
Air line (approximately)
125 kilometers
68 nautical miles