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Posted by
8552 posts

When we were affected by this in April, the B was not functioning between CDG/Nord period -- either direction. Cannot speak to that being true for you on your dates, but so it was then. Absolutely take a taxi rather than deal with this.

Posted by
10199 posts

The website that you linked to — the official site of the entity that runs Paris's airports — says twice on that very page that it is in both directions:

First, in the headline (“to and from”)

RER B line works to and from Paris-Charles de Gaulle airport

(In the above sentence, “works” is a too-literal French translation -the sentence means construction on the RER B line to and from Paris-Charles de Gaulle airport.)

Then, in the secondary language with the specific example of the dates of June 18 and 19: (“in both directions”)

On 06/18/22 and 06/19/22, all day, modernization works on the northern axis will require the interruption of traffic in both directions between Aulnay-Sous-Bois and Aéroport CDG 2.