The calculated distance (air line) between La Voulte-sur-Rhône and Montpellier is approximately 94 miles respectively 150 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between La Voulte-sur-Rhône and Montpellier has been calculated here.
Air line (approximately)
150 kilometers
81 nautical miles