The calculated distance (air line) between Saint-Maximin-la-Sainte-Baume and Marseille 12 is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Marseille 12 is certainly longer, as only the direct route (as the crow flies) between Saint-Maximin-la-Sainte-Baume and Marseille 12 has been calculated here.
Air line (approximately)
38 kilometers
21 nautical miles