The calculated distance (air line) between Charvieu-Chavagneux and Grenoble is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Charvieu-Chavagneux and Grenoble has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles