The calculated distance (air line) between Laudun-l'Ardoise and Grenoble is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Laudun-l'Ardoise and Grenoble has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles