Use the train instead! Its cheaper, you can use your T10 ticket using 1 journey and you can also transfer from train onto the metro at Sants.
Love the design and self driving trains! Really feels like the future.
It's better to go to T2 and take the Renfe train that put at Sants or Passeig de Gràcia
Metro station aeroport T2 ticket machine and tourist information. Excellent
Difficult to buy tickets from the machine.
Train only every 30 minutes. Very crowded and not so much space to put your luggage. Train to centre cost 4.80€