The calculated distance (air line) between Bagnols-sur-Cèze and Marseille is approximately 71 miles respectively 114 kilometers.
By car or train, the actual journey to Marseille is certainly longer, as only the direct route (as the crow flies) between Bagnols-sur-Cèze and Marseille has been calculated here.
Air line (approximately)
114 kilometers
62 nautical miles