My husband and two young daughters (6 & 3) are needing to get to ORY from CGD for a connecting flight that leaves 6 hours after we land. I have ready about Air France Bus, which sounds the most stress free but for 84 EU sounds expensive. Are there any recommendations for cheaper but just as stress free options that might (by some miracle) cost less?
By public transport, the most stress-free by far is the direct Air France bus.
It's a little cheaper and still not too stressful to take the RER B line across Paris and to Antony where you change for the Orlyval shuttle. Buy combined tickets at CDG. The ticket price is 54.20€ (children under 4 travel free). There is good signage all the way. Most trains from CDG stop at Antony but check the screens at the station to confirm. If there's a strike or other traffic disruptions on RER B, take the Air France bus.
You can also take RER B to the Denfert-Rochereau stop in Paris and change there for the Orlybus bus service. At CDG, buy tickets for Paris, and then buy Orlybus tickets at the bus stop. The transfer is fairly painless even with luggage. The total fare is €48.85 — this option is cheaper for adults but not so much for children because as far as I can tell Orlybus has no reduced fare (I think children under 4 do travel free however). The only advantage of this option is that you get to spend a few minutes in Paris (Denfert is a nice spot to have a croissant in a café), but this is probably not convenient with children.
I think you can get all the way through Paris for €5.10 per person by a combination of local buses and the metro (there may even be a €3.40 option), but that's not something I'd do with luggage let alone children.
Public transport options could be a bit cheaper but might not qualify as “stress free” for you. You would need some combination of RER and buses with at least one connection in the center of Paris. Six hours is plenty of time so there is no need to be really worried but I can imagine that it could be quite stressful to find your way through an unknown city with bags and kids. Unfortunately, you still need to buy four tickets so you would not save that much money compared to the Air France bus.
Taxi might actually be a good option for you. For an individual, it's more expensive but because you must effectively multiply the price of other options by four, it would still be competitive for a family. I am not sure of the exact price, however. There are some private shuttle services too (main difference is that you have to book them in advance and they can't wait at the taxi stand) but they do not seem cheaper.
Air France cars, taxi and private shuttles should all take about the same time and are very dependent on traffic but with 6 hours between the flights I would not worry.
i would highly recommend the use of public transportations. it's cheap and fast. Use the RER and ORLYVAL. Be only carefull of strikes, so if is anounced, plan to use taxi. It is expensive and highly depends on traffic conditions. (rush hours, accidents...). From CDG to ORY, a smart driver won't get stucked but it will cost you high $$$.
hope it help
André (from France)