From the airport
From Charles de Gaulle airport
RER station is located at "Roissypole", linked by CDGVAL light rail.:
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From Terminal 1: The RER station is not located inside Terminal 1.
Take the CDGVAL light rail (5 minutes journey) to "Terminal 3-Roissypole".
CDGVAL station for Terminal 1 is located at level 2;
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From Terminal 2: RER station is underneath Terminal 2, between Terminal 2C/2E and 2D/2F.
Go to the rail station by walk (look for "Paris by train" or "Gare" signs) or board free shuttle bus ;
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From Terminal 3: The RER station is not located inside Terminal 3.
Look for "Paris by train" signs (follow the signposted footpaths).
RER station is 400 meters away from the terminal (5 minutes journey by walk) .
From Orly airport
Take the Orlyval at the price of 7.20 Euros (Automatic rail link connecting to RER line B) to the Antony station and then transfer to the RER B going to Saint-Rémy-lès-Chevreuse. Buy a ticket at Antony at the price around 2.00 Euros. Get out at the station "Orsay-Ville " for LAL-Orsay and at "Le Guichet" for Irfu/Saclay.