The calculated distance (air line) between Berre-l'Étang and Montpellier is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Berre-l'Étang and Montpellier has been calculated here.
Air line (approximately)
105 kilometers
57 nautical miles