The calculated distance (air line) between Montluel and Aix-en-Provence is approximately 162 miles respectively 260 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 Montluel and Aix-en-Provence has been calculated here.
Air line (approximately)
260 kilometers
140 nautical miles