The calculated distance (air line) between Saint-Bonnet-de-Mure and Montpellier is approximately 154 miles respectively 249 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Saint-Bonnet-de-Mure and Montpellier has been calculated here.
Air line (approximately)
249 kilometers
134 nautical miles