I don't see any reason why you wouldn't be able to use the Mobilis in this way (in the same way that you can travel to Disneyland Paris with no problem using that same Mobilis). I have a Navigo, though, so haven't personally done this. Perhaps wait and see if others come along who have done it?

The reason is just because it doesn't cover that route, that's all, it isn't the same ticket as the Navigo and never has been (even when the Navigo was a Carte Orange, they just have different limitations). The Mobilis has limitations and RATP says it doesn't cover the RER to the airport, that's all I know. If they've changed that, their website still says you cannot, eg this the description of coverage on the RATP website for the Mobilis

<< Vous pouvez vous déplacer sur tous les modes de transport d'Île-de-France, Métro, RER Bus, Tramway et Train à l'exception de Filéo, Voguéo et les liaisons desservant les aéroports (Orlyval, Orlybus, Roissybus, Orly et Roissy par RER). L’accès par les lignes 183 et 285 pour l’aéroport d’Orly et les lignes 350 et 351 pour l’aéroport de Roissy est possible (pour les zones concernées).>>

If kerouac sid something else, I don't know why RATP would have that on their website unless they very recently changed it. What post did kerouac say you could use the Mobilis for CDG?

Thanks bdsbeautyblog and Christina for your replies!

Christina, I saw kerouac mention this in passionfruitdrink's mammoth Paris thread.

http://www.fodors.com/community/europe/transportation-in-paris-any-advice.cfm#comment-7879648

"Anything for zone 5 works to and from CDG. The only thing on which the passes are not valid is the Orlyval at Orly."

So now I'm confused whether the Mobilis works from the airport to Paris or not.

I don't understand why you just can't buy an RER ticket into Paris from the airport if that's what you want. Then get a carnet of tickets for the rest of your trip.

<< I'll be using the metro/RER extensively for that very same day (provided jet lag doesn't get me) as it may be too cold for me to walk everywhere (depending on the weather.)>>

Where on earth would you be planning to go on your first day in Paris after an overnight flight that you'd be needing to use the RER (not to mention the métro) "extensively?"

I wasn't aware the mobilis ticket covered zone 5??

info on using the train in Paris

http://parisbytrain.com/paris-rer/

theotherside, thanks for the link! It was extremely helpful.

StCirq, I'm not sure exactly what I said or did to be on the receiving end of such brusque language from you. I've seen your other posts and while your 'tone' is generally brusque, you have been nicer to people who seem to have done zero research on their own. I did my due diligence and I definitely do not deserve the tone in your answer.

Of course Mobilis has zone 5 , you can buy lots of tickets with that zone in it. Mobilis isn't some defined ticket that only covers certain zones,you buy the zones you want just like for the Navigo, so if you buy one with zone 5, it covers it, but it's a lot more expensive (about 15.6 ) than buying one only for zones 1-2 (6.6 euro). You aren't going to be saving anything, anyway, as the ticket for the RER from CDG is about 9.25 euro, and add that to 6.6 and you end up with the same price.

I read that post and I would interpret that for what Kerouac said, also, but even though he lives in Paris, he is not actually omniscient and he may just not know or ever use the Mobilis with 5 zones. I doubt if he does as if he lives there, he would have the Navigo. I would believe RATP and what they say on their own website. If you can't read that French, it clearly says the Mobilis does not cover any form of transportation going to the airports (Orly or CDG), except the buses no. 350 and 351. It doen't cover Orlyval, or the RER to either or the Roissybus or Orlybus (special airport buses into Paris).

Here's the official resource in English

http://www.transilien.com/static/tarifs/mobilis

<<Beware! Mobilis will not take you to the Roissy Charles de Gaulle or Orly airports. To get to these airports, choose for Paris Visite. >>

I doubt you'll be using the metro/RER "extensively" that very same day.

Most take it easy day of arrival, explore the neighborhood noting location of cafes, restos, patisseries, pharmacie, etc., and take care of errands like purchasing the best transit pass(es) for their visit.

One way ticket from CDG on RER/metro costs 9,50.

A carnet of t+ tickets, 13,30, would be the better bet anyway.

Zone 1-5 Mobilis 15,65.

So, a point-to-point ticket plus a carnet is the better bet, anyway, unless you'd ride more than 4 times after the airport trip day of arrival.

You may not want to venture too far from where you're staying day of arrival, as you just never know when jet lag will kick in and your legs turn to noodles. If that happens, it's good to know how to use the buses, rather than climbs those metro/RER stairs.