Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kerala to Isle of Wight as you normally would.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Kochi Airport to Richmond Byrd Intl Airport flight would often be abbreviated as a COK to RIC flight. Norfolk Airport (ORF), Newport News Intl Airport (PHF), Pitt-Greenville Airport (PGV) are other airports near this flight route and their unique identifiers/IATA codes.