Q: I am arriving at at Barcelona Airport and need to know the timetable for the Monbus service to Sitges. A: You can look up the Monbus timetable from the Monbus official website (follow our link below). Once you have selected your date of travel select Aeroport de Barcelona. Answer 1 of Looking at a recent Monbus schedule it looks as though for August they have buses going every half-hour starting in the morning (as opposed to only running this twice an hour after 12 noon). Can anyone confirm this? I always thought it was only. Autocars Monbus. Discrecionals i línies regulars: Vendrell - Barcelona, Vilanova - Barcelona, Sitges - Barcelona, Vilanova - Arboç, Ribes - Barcelona, Calafell - Valls, Vilanova - Cubelles.