You can travel to the island of Noirmoutier from Lyon by train and bus in five steps:
1) Take a train from Lyon Part-Dieu to Nantes, with a connection in Paris.
2) Transfer between Paris Gare de Lyon and Gare Montparnasse. Depending on your connection time and preferences, you can get there by metro, self-service bike, taxi, etc. Depending on the season, some direct trains from Lyon to Nantes may be available with no transfer in Paris.
3) Continue your journey to Nantes from Paris Montparnasse station.
4) Head to the Nantes bus station, located opposite the south exit of Nantes SNCF train station..
5) Board the Aléop line 13 coach (“Nantes – Fromentine – Noirmoutier”). This line serves multiple stops on the four communes of the island of Noirmoutier: Barbâtre, La Guérinière, L’Épine, and the Noirmoutier-en-l’Île bus station, its terminus.
Duration: From 6 hours and 34 minutes for the journey from Lyon Part-Dieu to the Noirmoutier-en-l’Île bus station, without a connection in Paris.
From 6 hours and 51 minutes for the same journey with a connection in Paris.