The calculated distance (air line) between Carlsbad and Rancho Penasquitos is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Rancho Penasquitos is certainly longer, as only the direct route (as the crow flies) between Carlsbad and Rancho Penasquitos has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles