How to get to L2S
L2S and CentraleSupélec are located 30km to the south of Paris.
How to travel to Gif-sur-Yvette:
From Orly airport (around 30 mn) :
Take ORLYVAL until Antony, then take RER B (commuter train) to SAINT-RÉMY-LÈS-CHEVREUSE direction. Stop at Massy-Palaiseau station and take the 91.06 bus. Ask to stop at 'Moulon' station. You also can stop at Le Guichet station and then take the 9 bus. Step out at 'Moulon' bus stop.From Roissy Charles de Gaulle airport (around 1h) :
Take RER B (commuter train) to SAINT-RÉMY-LÈS-CHEVREUSE direction. Stop at Massy-Palaiseau station and take the 91.06 bus. Ask to stop at 'Moulon' station. You also can stop at Le Guichet station and then take the 9 bus. Step out at 'Moulon' bus stop.
For further information on the costs and itineraries, see the official site of RATP.