The calculated distance (air line) between Bellegarde and Aix-en-Provence is approximately 49 miles respectively 79 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 Bellegarde and Aix-en-Provence has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles