Public Transportation Facilities


The CS campus in Gif/Saclay is 40 km from Notre-Dame, Paris. In the evening shuttle buses will be available to a central point with direct access to Paris and high-speed train station. Paris is very well connected by metro, bus and the RER suburban trains.


A quick and easy way to travel around the city, as well as the  best value. A single metro ticket costs €1.90 and can be used for one journey, including all connections.

White coloured tickets can be purchased singly or in a book of 10 (“carnet”) for €14.50 at the ticket offices or machines in metro stations.

The metro operates every day from around 06:00 to 00:30. The times of the first and last trains vary depending on the point along the line that you are departing from. Trains are less frequent on Sundays and public holidays. More information can be found here.

For a map of the metro lines, click here.


RER is a rail network covering most of the Ile-de-France region. It consists of 5 lines referred to by the letters A, B, C, D and E. Within Paris, the RER operates in more or less the same way as the metro, except that you need to put your ticket through the automatic barriers a second time on the way out. If your RER station has a connection with the metro, you can use the same ticket for the whole journey.

Using the RER is faster than the metro because stops are less frequent. It operates every day, including public holidays, from around 06:00 to 00:30. The regularity of the trains is similar to the metro, although you may have to wait longer for trains to certain suburban destinations. In the RER, as long as you remain within the city limits, tickets and prices are identical to the metro (RER stations also have their own ticket offices and machines).

More information can be found here.

A map of the RER network can be consulted here.


The bus network matches and complements that of the metro. Buses operate Monday to Saturday from 07:00 to 20:30. Some bus lines also operate in the evening from 20:30 until 00:30, in particular those that begin at train stations or serve major metro and RER links, as well as the 3 circular PC routes. There are also night buses, called Noctilien. For a map of the bus network, click here. Also, see information about the Noctilien.