The calculated distance (air line) between Balaruc-les-Bains and Montpellier is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Balaruc-les-Bains and Montpellier has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles