Paris Orly airport to CDG airport transfer

Take métro 14 to Châtelet, transfer to RER B, direction Roissy/Charles de Gaulle (CDG). Cost is 13€. Fare is loaded onto either a configured smartphone using the IDF Mobilités app or the Bonjour RATP app, or an Easy card (2€).

The quickest as well as cheapest way it going to be to take the train which you can do for one 14 Euro ticket. Get the Metro 14 at Orly which is well signed. You can get the RER B at Chatelet.

Otherwise get a cab from the official queue -- cabs but not bolts or ubers can use the bus lanes-- but that can be a lot of traffic on this trip.

I didn't notice how old the initial post is. Not much point resurrecting an old post for information like this. The OP has presumably long come and gone.

We used an Uber to go from Orly to CDG. $72. We had checked luggage and did not want to mess with a train or a bus. Worked well. There is a designated area at Orly for Uber type rides.