These are single tickets - for a return trip please buy 2 tickets.
You can start your journey from any Metro/RER station within zone 1 or 2 to catch the RER C (you can change to the RER C line at various stations - Bibliotheque F.Mitterrand, Gare D'austerlitz, St-Michel Notre Dame, Musée d'Orsay, Invalides, Pont de l'Alma, Champ de Mars Tour Eiffel, Javel and Boulevard Victor) or from any station on the RER C line between the stops of Bibliotheque F. Mitterrand and Versailles-Rive Gauche.
Please note: If you decide to physically leave the underground system during your journey, your ticket will no longer be valid.
Notes: This is a material ticket which will be sent to you by post.
Please be aware that between 15th July and 22nd August RER line C will be closed for maintenance between Javel, Avenue Henri Martin and Paris Austerlitz, however metro line 10 stops at Javel and from here the RER line C will take you out to Versailles.