Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Catania as you normally would.
Catania Fontanarossa (CTA) is the airport you will fly into if you book a flight from Bangkok to Catania. You should not have trouble finding flights to Fontanarossa from Bangkok; the airport handles an average of 0 inbound flights from Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Catania airport from Bangkok. It is only a 4.9 km journey from Fontanarossa (CTA) to Catania’s city centre.
Bangkok Suvarnabhumi Airport is BKK and Catania Fontanarossa Airport is CTA. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. Bangkok Don Mueang Intl Airport (DMK), Rayong Utapao Rayong Pattaya Airport (UTP), Hua Hin Airport (HHQ) are other airports near this flight route and their unique identifiers/IATA codes.