Best form of transportation Paris to Rouen, France

Joann, it looks like the nearest railway station is Val-de-Reuil, which is about 6 or 7 miles away (actually, as the crow flies it's a lot closer, but Connelles is on the other side of the Seine, with limited options for crossing). TER or Intercites trains will get you there from Paris St. Lazare in 1 hour 15 minutes or less, and the standard price is €18.90 one way. See http://en.voyages-sncf.com/

Joann, it looks like the nearest railway station is Val-de-Reuil, which is about 6 or 7 miles away (actually, as the crow flies it's a lot closer, but Connelles is on the other side of the Seine, with limited options for crossing). TER or Intercites trains will get you there from Paris St. Lazare in 1 hour 15 minutes or less, and the standard price is €18.90 one way. See http://en.voyages-sncf.com/ Kevin, Thanks for the helpful reply. Sorry I am so ignorant on this subject but I am now wondering, can one rent a car from Val-de-Reuil? If so, would you suggest taking the TER to there and then renting a car? Will still need to get back to the CDG airport five days later. Any suggestions?
Joann

Well, Google tells me that there is a choice of car hire places in Louviers, and to get there you have to change trains in Val de Reuil or in Evreux, but there can be quite a lot of waiting around for the connecting train, so I think it may be simpler just to get the train to Rouen and hire a car there. Paris St. Lazare to Rouen Rive-Droite takes as little as 1 hour 8 minutes and the standard fare is €22.80. Hertz, Avis and Europcar have offices at Rouen Rive-Droite.

If you book well in advance (up to three months allowed) on tgv-europe.com, you can get a Prem's fare as low as €10.00 for Paris to Rouen Rive-Droite. Your ticket will be for a specific departure date and time and is non-exchangeable and non-refundable so be sure you can commit before booking.

Kevin and Tim, Thanks to both of you. Your information has been MOST helpful.
Joann

Well, I have purchased our rail ticket (e-tkt) from Paris to Rouen, thanks to your help. I purchased a ticket from Paris-St.Lazare however, we will be staying in arrondissement 11 near mthe Place de la Republique and it looks like Gar De L'est is the closest station. Can I use the ticket I just purchased but still board the train at De L'est instead of St. Lazare ? Also I compared prices of renting a car in Rouen and returning to Rouen verses Pick-up in Rouen (at train station) but returning to CDG airport and they cam out the same price. Does this sound right to you? Also do you have any idea which terminal I want to end up in at CDG (there was a choice of 3). We are flying on United.
Joann

The train does not leave from, or pass through, Gare de l'Est. You can take the metro (separate ticket) to St. Lazare.

Thanks Adams. This brings up another question. Am I correct in thinking that, in Paris, the same type of ticket can be used on the bus (around town) and the metro?

Metro line 3 goes directly from Republique to Saint-Lazare. The ride takes 12 minutes. A single t+ ticket is good anywhere the Metro goes (some lines end in zone 3) and on the RER in zone 1 (all of central Paris). It provides unlimited transfers until you exit the system. A single t+ ticket is good for bus transfers up to 90 minutes after boarding the first bus. However, you cannot transfer between Metro/RER and bus on a single ticket. There usually is no extra charge for returning a car to a point other than the one where you picked it up, so long as both points are in the same country. While there is an extra charge for picking up a car at an airport, there isn't one for dropping it off at an airport.

Again thanks. Your information on how tickets can specifically be used is very clear and helpful; especially the part about transfers (within the 90 min) and the non-mixed use etc.
After reading Rick Steves book, I was planning on purchasing a carnet (book op 10 tickets) thinking we could use them on both the buses and trains in the seven days we plan to be there. Is my thinking correct?

United uses Terminal 1.