The calculated distance (air line) between Barrancabermeja and Montelíbano is approximately 124 miles respectively 200 kilometers.
By car or train, the actual journey to Montelíbano is certainly longer, as only the direct route (as the crow flies) between Barrancabermeja and Montelíbano has been calculated here.
Air line (approximately)
200 kilometers
108 nautical miles