I am trying to decide which pass would be best to get. I will be travelling from CDG to Paris (St Germain) and then one day trip out to Versailles.
I am trying to be as cost effective on a pass, and trying to know which would be best and what passes can be used on subway, metro and RER lines.
Please help! I leave This Saturday 1st October from Seattle to Paris
If you're staying for more than a few days than Navigo Découverte is the best, by far. Your first day won't be covered though as you're landing Saturday/Sunday and Navigo starts validity on Monday, even if you purchase it on Sat/Sunday. To get into Paris from CDG buy a single RER ticket that is also good for a transfer onto Metro when inside of Paris to get you to your hotel. Then you can use a Ticket Mobilis 1-2 zone day pass for the days before Monday. From then on Navigo is your best bet.