Travel by road
Please follow the instructions on the following document:
Travel by train
Map, travel plans and timetables of public transportation
RATP : http://www.ratp.fr/
SNCF : http://www.sncf.com/
From the airport Roissy, take the RER Line B which connects Paris with the area of Saclay and Orsay located at South.
The direction is “Saint Rémy- les Chevreuse”, and the station is Le Guichet.
Check that the train you take stops at « Le Guichet » (not all of them do so, there are panels on the platform indicating at which stations the train stops ; on the board, if the light is on it means that the train stops at the place). Travel will take around 1 hour 15 min.
From the airport Orly, go to the station “Antony” of line RERB by taking the line “Orlyval” (cf www.ratp.fr) and there, take the RER Line B. direction which connects Paris with the area of Saclay and Orsay located at South.
The direction is “Saint Rémy- les Chevreuse”, stop at the station is Le Guichet (check the stops of the train, see indications above).
Once at the station “Le Guichet”,
You may exit on the side “Rue Louise Weiss” (Street Louise Weiss opposite to the platform) and take the bus line number 9 (one bus every 15 minutes at the rush hours). This bus will drive you to the plateau of Saclay. Stop at the "CEA Porte Nord" station.
Shuttle buses information: