Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Diego to Ocho Rios as you normally would.
SAN and OCJ are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. SAN to OCJ refers to a flight route from San Diego Airport to Ocho Rios Boscobel Airport.