The calculated distance (air line) between Tournon-sur-Rhône and Montpellier is approximately 111 miles respectively 179 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Tournon-sur-Rhône and Montpellier has been calculated here.
Air line (approximately)
179 kilometers
97 nautical miles