The calculated distance (air line) between Champagne-au-Mont-d'Or and Marseille is approximately 175 miles respectively 282 kilometers.
By car or train, the actual journey to Marseille is certainly longer, as only the direct route (as the crow flies) between Champagne-au-Mont-d'Or and Marseille has been calculated here.
Air line (approximately)
282 kilometers
152 nautical miles