score:5
RATP trip planner gives 53mn at 10 o'clock, november 28th, 2013.
The route is:
On foot walk to Gare du Nord – RER
from Gare du Nord
RER Ligne B direction Saint-Remy-les-Chevreuse
up to Chatelet-Les Halles
On foot connection
from Chatelet-Les Halles
RER Ligne A direction Saint-Germain-en-Laye
up to La Defense (Grande Arche)
On foot connection
from La Defense (Grande Arche)
SNCF 55 direction La Verriere
up to Versailles-Chantiers
Versailles-Chantiers is about 1km south-east from Château de Versailles.
To Versailles-Château-Rive gauche, this is 1h06:
On foot walk to Gare du Nord – RER
from Gare du Nord
RER Ligne B direction Saint-Remy-les-Chevreuse
up to Saint-Michel Notre-Dame
On foot connection
from Saint-Michel Notre-Dame
RER Ligne C direction Versailles-Rive Gauche
up to Versailles-Rive Gauche
Upvote:2
According to Rome2Rio 33 minutes.
Upvote:8
There are two main stations in Versaille, Versailles - Château - Rive-Gauche on the RER C, and Versailles - Rive Droite on regular suburban network. The Château stop is about a 5 minute walk to the entrance, which the Rive Droite one is closer to 10. There is also Versailles - Chantiers on the RER C and local lines, but that's the furthest.
I'd suggest you use this Rome2Rio query for a general idea, which should weight up the different walking options from the different stations. You're basically looking at about 50-60 minutes, depending on connections. Be aware that a regular Metro/RER ticket won't be valid as far out as Versailles, so you'll need to visit a ticket machine and buy a ticket for the journey - you can't just use a regular carnet one for example.
You can also use the RATP trip planner to check exact times, but you'll need to search for each of the 3 stations individually, then factor in the walking times by hand. You'll probably either want to take the RER B to Saint-Michel Notre-Dame and change to the RER C, or the RER E to Gare Saint-Lazare and change onto a local SNCF service to Versailles-Rive Droite. (Metro 4 to Montparnasse then local train to Versailles Chantiers suffers from poorer frequency, but is a tiny bit faster if it works out)