Using the Bus
First thing to do is to get on this bus directly outside the airport terminal. There may be a long line, but the bus advertises as coming every 15 minutes (Although I have found it comes more often) and I have never had to wait for more than 20 minutes for the longest line. After getting on the bus, you will ride for roughly 35-50 minutes and stop twice before you arrive at Plaza Catalunya (once at Plaza España and once at Calle Urgell).
Once you reach Plaza Catalunya (pictured to the right) you will have to enter the metro. Look for the entrances closest to the top of the block with the El Corte Ingles on it. Your Have 2 choices here. You can walk on the right side of "Corte Ingles, and that will take you right onto Rhond Sant Pere Street- then proceed straight ahead 3 blocks, or if not sure about walking, then you want to switch to underground Metro and catch the red line for two stops to Arc De Triumf. Once you get to that stop, exit toward "Passeig San Joan" and take a good look at the magnificent Arc de Triumf when you reach the street. You will want to cross the large street (Called Passeig Sant Joan) and take the street that goes off it at a slight diagonal and which is called Ronda Sant Pere. You will follow this street for one block before looking for the l Subirats on the left.
Welcome to your home away from home in Barcelona!
Taking the Renfe
Immediately after exiting your terminal, look for the large tunnel that leads over a parking lot. It is pictured to the right and is difficult to miss no matter which terminal you arrive from. If you go up and across this tunnel it will take you directly into the Renfe Station. Inside the tunnel are moving walkways so it is not especially difficult to cross.
You will take the Renfe all the way to the Arc de Triumf and exit toward "Passeig San Joan"
Welcome to Subirats