What is best way to get from Vesailles to Orly on a Sunday afternoon? Would it be easy to get a taxi and how much approximately might it cost? What train / bus etc could I use instead of a taxi?
The best combination of price and travel time from Versailles to Orly airport would be Bus #1 from Gare de Versailles - Rive Gauche (in direction Université (Versailles)) until Versailles Chantiers - Quai A (another train station in Versailles).
Then transfer to RER C train (requires a new/separate RER ticket) in direction Gare d'Austerlitz until Massy - Palaiseau station.
From there, take Bus 91-10 in direction Orly 1, 2, 3 (requires a new/separate bus ticket).
Total travel time is about 1h25m including transfers and costs in total €8.10 for the two bus tickets and one RER ticket.
I don't have any information regarding taxi to make the same trip although I could hazard a guess it would cost around €45.