The calculated distance (air line) between Carnoux-en-Provence and Montpellier is approximately 88 miles respectively 142 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Carnoux-en-Provence and Montpellier has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles