The calculated distance (air line) between Belleville and Aix-en-Provence is approximately 182 miles respectively 292 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 Belleville and Aix-en-Provence has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles