1

I am not sure if there is a SNCF agency at CDG. But unless you are spending a lot of time travelling from zone 1 - 5, its probably not economical to buy the Decouverte for all 5 zones. If you are spending most of your time in the centre of Paris, it probably makes more sense to buy an RER (or Roissybus) ticket to Paris, but a zone 1 decouverte in Paris for your travels, and then buy tickets for outside of Paris as required.

Note that they have recently changed the Navigo system so that a Navigo works for all zones on the weekend (so a Zone 1 Navigo is the same as a zone 1 - 5 Navigo on the weekend).

2

I am not sure if there is a SNCF agency at CDG. But unless you are spending a lot of time travelling from zone 1 - 5, its probably not economical to buy the Decouverte for all 5 zones. If you are spending most of your time in the centre of Paris, it probably makes more sense to buy an RER (or Roissybus) ticket to Paris, but a zone 1 decouverte in Paris for your travels, and then buy tickets for outside of Paris as required.

Note that they have recently changed the Navigo system so that a Navigo works for all zones on the weekend (so a Zone 1 Navigo is the same as a zone 1 - 5 Navigo on the weekend).

3

With a five-zone pass, you can use the entire network, including CDG, Versailles, the Roissybus or any other municipal transportation in the Paris metropolitan area -- except the Orlyval shuttle to Orly airport.

4

Thank you for your prompt replies. So in the case we can use the Navigo Semaine zones 1-5 also in Roissybus the ticket is worthwhile as it costs 33,90e + 5e = 38,90e. And it is easy to use as we do not need to spend time buying tickets.

Ticket to Roissybus two ways is 20e
Ticket to Versailles two ways is about 8 e
Ticket to Disneyland two ways is about 14 e
+ perhaps one Carnet 12,70e for Paris sightseeing

And the card is valid for 10 years so we can load it the next time we visit Paris.

5

When you make several trips to the suburbs, the extra zones on the card quickly pay for themselves.

Those of us who live here, however, have a new advantage with the domestic monthly Navigo pass -- the zones disappear for us on weekends and holidays, and we can go anywhere in the Paris metropolitan area.