One of the first things to do when visiting Barcelona is buy a T-10 integrated transport ticket. This magic card will give you access to all the city’s buses, metro trains, local trains, trams, night buses and funiculars (but not the cable-cars and privately run funicular to Tibidabo).
It’s a multi-person ticket which means up to 10 people can share the same ticket.
A single journey on the bus or metro is € 2 – a T-10 is € 10.30 – bargain.
Great, inexpensive tool for getting around. Use the bus – you’ll see more.
Also, importantly, you can use the ticket as many times as you need within a one and a quarter hour period and it counts as a single journey. Though be aware that once you leave the metro when you re-enter it will count as a new journey.
In practice what this means is you can catch a barrio bus (small, very local bus) to connect with a regular bus, travel across the city, jump on a tram, or train to a metro station and take a metro train to your final destination, and it all counts as a single journey.
Bus routes worth getting to know include:
45 & 20- will take you to and from the beaches.
24 – will take you from Passeig de Gràcia to Parc Güell and back again.
55 – a simple way of getting to and from Montjuic.