Paris Orly airport to central paris

I%26#39;d be travelling from Geneva to Paris this Monday, and would get down at Orly airport. What%26#39;s the best way to get to central Paris from there using public transport? Is it too long/inconvenient to use public transport from Orly?

Thanks in advance.

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Rick Steves lists these options: He says it is very efficient.

Gate numbers for for Orly Sud, but available at both terminals.

Jetbus (outside Gate H, 5.70, 4/hr.) is the quickest way to the Metro and a good way to the Marias and Luxembourg gardens neighborhoods. This takes you to Metro Line 7, convenient to Luxembourg/Marais areas.

Orlybus (outside Gate H, 6.20, 3/hr)takes you to the Denfert-Rochereau metro stop (RER B, Metro 4 and 6).

Air France bus (outside Gate K, 9 E one way, 14 return, 4/hr) to Invalides metro stop and Montparnasse train station, convenient for Rue Cler/Eiffel Tower area.

Orly Rail Bus (outside Gate G, 6 E, 4/hr) to RER C.

Orlyval trains to RER B (9.50 includes RER fare).

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We used Air France Bus - easy, fast, comfortable, not expensive:

…airfrance.com/cars-airfrance/index_en.html

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Thanks for your responses. Quite helpful.