The calculated distance (air line) between Saint-Genis-les-Ollières and Marseille is approximately 173 miles respectively 278 kilometers.
By car or train, the actual journey to Marseille is certainly longer, as only the direct route (as the crow flies) between Saint-Genis-les-Ollières and Marseille has been calculated here.
Air line (approximately)
278 kilometers
150 nautical miles