These transportation options in Caerphilly might help your romantic trip get off to a smooth start: To get to Caerphilly, book a flight to Cardiff International Airport (CWL), which is the closest major airport, located 13.2 mi (21.2 km) from the city centre. If you want to travel outside the city, take a train from Caerphilly Station, Aber Station or Energlyn & Churchill Park Station.