The calculated distance (air line) between Montpellier and Castelnau-le-Lez is approximately 2 miles respectively 3 kilometers.
By car or train, the actual journey to Castelnau-le-Lez is certainly longer, as only the direct route (as the crow flies) between Montpellier and Castelnau-le-Lez has been calculated here.
Air line (approximately)
3 kilometers
2 nautical miles