The calculated distance (air line) between Saint-Bonnet-de-Mure and Marseille is approximately 166 miles respectively 268 kilometers.
By car or train, the actual journey to Marseille is certainly longer, as only the direct route (as the crow flies) between Saint-Bonnet-de-Mure and Marseille has been calculated here.
Air line (approximately)
268 kilometers
144 nautical miles