St Lazare to ORY Transportation

There is no direct RER or bus service from St Lazare to Orly. Probably the fastest route is to get Metro Line 14 to Chatelet, and then RER Line B to Antony, from where there is a people-mover to the airport.

If there are 2 and especially if there are 3 of you, it will be cost effective grab a cab. It is not only clumsy to get to Orly by public transport with transfers from metro to RER and then to the Orlyval but it is rather expensive about 12 Euro apiece. Although Orly is closer to Paris than CDG, it is more expensive to get there on public transport. A cab should be about 30-35 Euro.

Thanks for the info, yes only 2 of us traveling so it looks like taxi would be better then the metro with transfers.