The calculated distance (air line) between Pont-Saint-Esprit and Montpellier is approximately 59 miles respectively 95 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Pont-Saint-Esprit and Montpellier has been calculated here.
Air line (approximately)
95 kilometers
51 nautical miles