How can I get to Palace of Versailles from Orsay by RER and bus? May I use one ticket for traveling? Describe the route and names of stations where i have to change the RER or buses, please.
RER B train direction Aeroport CDG 2 until Massy-Palaiseau
Transfer using same RER ticket to RER C direction Versailles Chantiers until terminus
Take bus # 262 (just outside Versailles-Chantiers station, you'll see signs for it) and use a new Ticket t+ or bus ticket (2€) in direction Gare de Versailles-Chateau Rive-Gauche two stops (right in front of the Chateau)
You can also just walk the last step and skip the bus. Walk is about 13 min. by foot from Versailles Chantiers station.