The calculated distance (air line) between Cagnes-sur-Mer and Grenoble is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Cagnes-sur-Mer and Grenoble has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles