The calculated distance (air line) between Miribel and Aix-en-Provence is approximately 161 miles respectively 258 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 Miribel and Aix-en-Provence has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles