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From Paris : 

Take the RER B (Different stops in Paris : Gare du Nord / Châtelet Les Halles / Saint Michel / Luxembourg / etc) in the direction of St Rémy-lès-Chevreuse and get off at Massy-Palaiseau. 

THEN depending on the time of the day take the buss 22, or 23, or  2

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For more information : consult the SNCF or RATP websites.

Coming from Paris :  A6-A10 Motorway – towards Chartres-Orléans, exit at Villebon – ZI Courtaboeuf - Courtabœuf 1

Coming from the west : R.RN.R 118 – From the Pont de Sèvres, towards Chartres-Nantes / Orléans-Bordeaux, - Courtabœuf 1
Exit 13 ORSAY - Mondétour ZI de COURTABOEUF

Coming from the east : A 86 Towards Versailles and then Bordeaux, - Villebon – ZI Courtaboeuf - Courtabœuf 1
Exit 13 ORSAY - Mondétour Z.I. de COURTABOEUF

Coming from the south : A 6 then the Francilienne towards Versailles – N118 towards Velizy Exit at –Les Ulis, towards ZI Courtabœuf 1

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The closest airport is Orly, but if you're coming from outside of France you will arrive at Roissy Charles de Gaulle - CDG.

From Orly

Taxi : about 20 minutes.

Public transporation : Take the OrlyVal  to Antony – Then take the RER B in the direction of St Rémy-lès-Chevreuse and get off at Massy-Palaiseau. In Massy-Palaiseau take the bus line 22, 23 or 2 in the direction of CC Ulis 2 and get off at the bus stop called Château d'eau. (Then consult the information in the PUBLIC TRANSPORTATION section). 

From Roissy

Taxi : about 60 minutes.

Public transportation : Reach the SNCF Terminal (Terminal 2 F) and take the RER B towards St Rémy-les-Chevreuses, get off at Massy-Palaiseau. In Massy-Palaiseau take the bus line 22, 23 or 2 in the direction of CC Ulis 2 and get off at the bus stop called Château d'eau. (Then consult the information in the PUBLIC TRANSPORTATION section). 

Consult flight schedules

For more information : consult the SNCF   or RATP   websites.

If you arrive within the Paris city limits you should head towards the RER B (you can find it in Gare du Nord / Châtelet Les Halles / Saint Michel / Luxembourg / etc) in the direction of St Rémy-lès-Chevreuse and get off in Massy-Palaiseau. 

The closest train station for the TGV is Massy-Palaiseau. 

In Massy-Palaiseau you should take the bus line 22, 23 or 2 in the direction of CC Ulis 2 and get off at the bus stop called Château d'eau. (Then consult the information in the PUBLIC TRANSPORTATION section). 

For more information : consult the SNCF  or RATP  websites.