The calculated distance (air line) between Calexico and Casa de Oro-Mount Helix is approximately 86 miles respectively 138 kilometers.
By car or train, the actual journey to Casa de Oro-Mount Helix is certainly longer, as only the direct route (as the crow flies) between Calexico and Casa de Oro-Mount Helix has been calculated here.
Air line (approximately)
138 kilometers
74 nautical miles