For those that haven't seen the news, the new extension of the Metro on line 14 towards Orly will open on
June 24th. If you do not have a Navigo monthly or annual subscription, the ticket to/from Orly Airport station will be subject to a special fare of 11,5€. (I'm guessing a Origine / Destination ticket ?). For those who have Liberte+ passes, it will work like Orlybus/Roissybus and charge the special fare to your end-of-month bill alongside any normal usage.
Notable travel times to/from Orly:
Olympiades - 16 minutes
Gare de Lyon - 23 minutes
Chatelet - 25 minutes
Saint Denis Pleyel - 40 minutes
Paris Aeroport website