Verified answer

There's no direct train from Charles de Gaulle airport to Château d'Olonne.

You have to take the train at Gare Montparnasse train station, in central Paris to Sables d'Olonne train station. There's a fast train, TGV. It takes about 3:40.

See http://www.sncf.com/

http://www.tourisme.fr/office-de-tourisme/le-chate...