The calculated distance (air line) between Laudun-l'Ardoise and Montpellier is approximately 52 miles respectively 83 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Laudun-l'Ardoise and Montpellier has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles