The calculated distance (air line) between Marseillan and Aix-en-Provence is approximately 97 miles respectively 156 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 Marseillan and Aix-en-Provence has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles