Flights from Ireland to Carcassonne directly currently operate as follows :
Cork to Carcassonne : June to September : Ryanair
Dublin to Carcassonne : April to October : Ryanair
Dublin to Toulouse : March to September : Aer Lingus
Dublin to Toulouse : April to September : Ryanair
For the remainder of the year you can fly to Toulouse and take the airport shuttle to Matabiau train station and then a 45 min train to Carcassonne.
See our page on how to get to Carcassonne for details of trains and buses etc
