Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Jakarta to Limerick as you normally would.
CGK and SNN 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. CGK to SNN refers to a flight route from Jakarta Soekarno-Hatta Intl Airport to Shannon Airport. Cork Airport (ORK), Knock Intl Airport (NOC), Milltown (Kerry) Kerry Airport (KIR), Galway Airport (GWY), Waterford Airport (WAT) are some additional IATA codes for airports related to your trip.