Châtillon

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From Paris Porte d'Orléans

Take the belt highway clockwise. Follow the direction of the A13 highway to Rouen.
Leave at "Porte de Châtillon", and take route D906 towards Clamart/Versailles.

From Orly airport

Take route N7 towards Villejuif / Créteil and then highway A86 towards Versailles. Get off at exit 30,
marked "Petit Clamart", and take D906 towards "Le Petit Clamart".

From Roissy Charles de Gaulle airport

Take highway A1 towards Paris Porte de la Chapelle.
Take the belt highway counterclockwise to the exit "Porte de Châtillon", and then route D906 towards Clamart/Versailles.

By transit system, from Paris

• Take metro line 13 to the terminal at "Châtillon Montrouge" then switch over to tram T6 to the stop "Parc André Malraux" and walk up to ONERA accross  "Parc André Malraux"
  (an alternative is to switch to bus 195, direction "Robinson RER", and get off at "les Sablons", just in front of Onera)

or
take metro line 4 to its terminal at "Porte d'Orléans". Switch over to bus 195,
direction "Robinson RER" and get off at "d'Estienne d'Orves / Division Leclerc".
Then walk 200 meters up the avenue de la division Leclerc to Onera.

By transit system, from Orly or Roissy airports

For travelling to Onera from the airports, you will need a specific ticket
for "Bourg-la-Reine" (RER B, kind of metro) and a simple ticket for the bus.

From Orly, take the VAL to "Antony", then take Rer B in the direction of Paris
and get off in "Bourg-La-Reine". Then take bus 394 (direction "Issy - Val de Seine RER") and get off at "Les Sablons", just in front of Onera.

From Roissy Charles de Gaulle, take Rer B towards Paris, and continue till "Bourg-La-Reine".
Then take bus as above.

useful @ddresses
to get by metro or RER : www.ratp.fr
to get by train : www.sncf.fr
to get by plane : www.adp.fr
to get by car: www.iti.fr