Hi Elke,
I checked out both the
RATP Itinerary planner and the
Transport Ile-de-France Itinerary tool and both recommend taking a RER C train from Bibliotheque François-Mitterrand or Gare d'Austerlitz for the fastest way from
Paris to Versailles.
If starting from the 12th arrondissement:
- Metro Line 6 till Bercy
- Metro Line 14 till Bibliothèque François-Mitterrand
- RER C direction Versailles-Rive Gauche (till Versailles-Rive Gauche)
A single
Billet Ile-de-France from
Paris to Versailles Rive Gauche will cost 2,90€ and cover you for both Metro and RER C, regardless of where you start.
Unless you plan on doing a bunch more trips around Paris during the same day, avoid the Ticket Mobilis 4 zone, which would be the required ticket for
Paris - Versailles which costs 9,60€. Return
Billets Ile-de-France between
Paris - Versailles would cost 5,80€.
Thanks for the information on the end of the Forfait Loisirs with Chateau Versailles.
Best regards,
Ben