Not sure if you can buy online as did not check however we did not have to queue for very long

I think we paid around 12 euros for a return trip. It was worth it.

Depends on how many cruise ships are in. When we visited there were 6 and it took us about 45 mins to get tickets.

Yes. Very straightforward.

We had a rail and bus passAnd we took the rail to the Finny killer. Definite killer was included with the pass. The gondola cost extra.

A lot depends on where your ship is moored. Assuming it is somewhere in the Port near the Christopher Columbus statue near the bottom of La Rambla, (or you can get a blue Cruise Shuttle Bus to the statue) I would walk from the Port up Av del Paral-lel to the Paral-lel Metro station (about 5-10minutes), where you can get on the Montjuic Funicular railway, which will take you up to the bottom cable car station. If you have a Barcelona travel card (or one of the other multi- use transport cards) you can use it on the funicular but not the cable car. I recommend booking the cable car in advance as it might be busy and you won’t want to walk up to the castle or stand in a queue on a hot day! Great views from the castle out to sea and over the city. If you are not setting off from the port, use the Metro or a bus to Paral-lel Metro (Lines L2 or L3)

il me semble que la carte hola bcn est valable uniquement pour les transports.

Profco, The Hola Pass does not include the Teleferic de Montjuic. I believe it is considered a tourist attraction, as opposed to public transportation, considering the city bus line (TMB) stops at the top and they do take the Hola Pass. Because the Hola pass allows multiple uses for days valid, plan your visits and select the routes that work best. Happy travels, Maitaimike2015

You can buy the tickets online or at the starting point of the cable car.