The calculated distance (air line) between Cúllar-Vega and Cartagena is approximately 151 miles respectively 243 kilometers.
By car or train, the actual journey to Cartagena is certainly longer, as only the direct route (as the crow flies) between Cúllar-Vega and Cartagena has been calculated here.
Air line (approximately)
243 kilometers
131 nautical miles