The calculated distance (air line) between Gignac-la-Nerthe and Montpellier is approximately 70 miles respectively 112 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Gignac-la-Nerthe and Montpellier has been calculated here.
Air line (approximately)
112 kilometers
61 nautical miles