The Orly run in practice
Orly is the closer of the two main Paris airports: roughly twenty kilometres from the centre, or 30 to 45 minutes depending on the hour. The route normally follows the A6, which is heavy southbound in the morning and northbound at the end of the day.
Since the airport was reorganised, the former South and West terminals became Orly 1, 2, 3 and 4. The number appears on your ticket or boarding pass: give it when booking so you are dropped at the right door rather than at the far end of the complex.
For an early flight, plan to arrive two hours before departure on a European service. Leaving central Paris at five in the morning, the roads are clear and the journey often takes under thirty minutes.
