Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Cebu to Limerick as you normally would.
Great question - CEB to SNN just means Cebu City Mactan Intl Airport to Shannon Airport. Now you’ll know what these unique codes when you look for flights! Cork Airport (ORK), Knock Intl Airport (NOC), Milltown (Kerry) Kerry Airport (KIR), Galway Airport (GWY), Waterford Airport (WAT) are other airports near this flight route and their unique identifiers/IATA codes.