The calculated distance (air line) between Saint-Martin-le-Vinoux and Montpellier is approximately 143 miles respectively 230 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Saint-Martin-le-Vinoux and Montpellier has been calculated here.
Air line (approximately)
230 kilometers
124 nautical miles