What's the smartest way to use public transit in Barcelona?
Buy a T-Casual card (10 trips, roughly €11.35) the moment you land at El Prat, load it at any TMB machine, and use it across the metro, buses, trams, and the FGC suburban rail within Zone 1, which covers essentially everything a visitor needs. One tap covers a single journey including transfers within 75 minutes, so you can switch from metro to bus without paying again. The L3 green line and L5 blue line handle most tourist corridors between Barceloneta, Passeig de Gràcia, and the Eixample. Avoid taxis for anything under 3 kilometers during daytime. The Aerobús from Terminal 1 or T2 to Plaça Catalunya costs €6.75 and runs every 10 minutes, but the metro L9 Sud connects the airport too, though it requires a special airport supplement on top of your T-Casual. Google Maps reads Barcelona's network accurately in real time, so routing is never a guessing game.
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