The calculated distance (air line) between San Fernando de Monte Cristi and Boca Chica is approximately 165 miles respectively 265 kilometers.
By car or train, the actual journey to Boca Chica is certainly longer, as only the direct route (as the crow flies) between San Fernando de Monte Cristi and Boca Chica has been calculated here.
Air line (approximately)
265 kilometers
143 nautical miles