The calculated distance (air line) between Saint-Julien-en-Genevois and Aix-en-Provence is approximately 183 miles respectively 295 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 Saint-Julien-en-Genevois and Aix-en-Provence has been calculated here.
Air line (approximately)
295 kilometers
159 nautical miles