WE ARRIVE IN BCN AROUND 11, BY THE TIME WE GO THRU all the procedures can we still make the train down to Sitges?
There is no direct train ever from the airport to Sitges. You have to change, normally at Sants.There is currently total chaos on the railways south of Barcelona (for at least another week) and in that case impossible for you to get there as it involves buses and going to a station south of Sitges and doubling back).
Another poster mentioned MonBus to Sitges, so google them and see if you can find the timetable and departure of last bus.
In any case though as you may have to be be bussed from plane to terminal and if you also have to wait for luggage, that will add at least 30mins on to arrival time.
If you are coming after next week (or perhaps after mid-Nov, say, to be on the safe side): www.renfe.es would give you timetable and where you have to change (not sure if also possible at El Prat).
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