I will fly home from Orly, but I will go to Paris Air Show so maybe I could return to Paris by use of this ticket?
1 answer
RER B Train tickets from CDG to Paris is a 5-zone ticket so you could use it to travel from Paris to Orly using the Paris Metro + Tram 7 or the Orlybus. Note this ticket is not valid on Orlyval Train, which requires a special ticket just for the Orlyval Train.