The calculated distance (air line) between Balaruc-les-Bains and Narbonne is approximately 38 miles respectively 62 kilometers.
By car or train, the actual journey to Narbonne is certainly longer, as only the direct route (as the crow flies) between Balaruc-les-Bains and Narbonne has been calculated here.
Air line (approximately)
62 kilometers
33 nautical miles