The calculated distance (air line) between Cagnes-sur-Mer and Aix-en-Provence is approximately 85 miles respectively 138 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 Cagnes-sur-Mer and Aix-en-Provence has been calculated here.
Air line (approximately)
138 kilometers
74 nautical miles