Q: How can we travel from Barcelona Airport to Sitges?
A: You have 2 main options:
Bus: You can either take the MonBus service which runs from Barcelona Airport Terminal 1, (T1) or
Train: you can take the RENFE train from the airport to El Prat de Llobregat which is the first stop after Barcelona airport Aeropuerto and then change for a train that takes you to Sitges.
For detailed information on both of these options I recommend you visit our webpage that explains the options in more detail. Here is the link