The calculated distance (air line) between Saint-Cyr-sur-Mer and Montpellier is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Saint-Cyr-sur-Mer and Montpellier has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles