We are travelling in July from Orly to Norte Dame. We pre purchased 4 day Paris Pass w transportation ticket to some zones(1-5 I think) if we board RER B
At Orly to St Michel could we use that ticket?
In checking looks like a 50 pound taxi or Uber for 4 people. How much would train be for 4 w luggage?
A taxi from Orly to Notre Dame will be 35 euros at most, fixed rate (the 50-euro --not pound--taxi is to/from CDG).
Which Paris Pass do you have? Paris Visite?
If you have not actually purchased the Paris Pass don't; it is an overpriced tourist product. If you have and have a Paris Visite 1-5 zone pass you can use it from Anthony RER to Paris. You have to take the Orlyval to Anthony and I don't believe it is covered by the Paris Visite you have purchased. (many Paris Passes only include zone 1-3 Visites though so be sure you have a 1-5)
A cab for 4 people from Orly to Notre Dame would cost 35 Euro. No extra charge for luggage. It is 30 to the left bank but I think Notre Dame although in the middle of the river is in eme 4 and thus considered right bank. It is much cheaper than public transport in any case, although perhaps not if you already have the Visite passes.
Anthony is in zone 3, so you pay for the Orlyval shuttle. 9.30 EUR pp. However, if you have a zone 1-5 Visite, you can use it by taking the bus to Pont de Rungis RER station and take the RER C to St Michel-Notre Dame.