Getting to Barcelona Cathedral by public transport
La Sagrada Familia has its very own Metro station (called, unsurprisingly, La Sagrada Familia Metro station) on Lines L2 & L5.
And there is some excellent news for wheelchair users:
La Sagrada Familia Metro station is wheelchair accessible. But, more than just that, the accessible entrance/exit of Line L2 trains (the "Mallorca-Marina" exit), is directly opposite the accessible entrance to the actual La Sagrada Familia. There is also an accessible exit for L5 trains (the "Provença / Avinguda Gaudí" exit), but the lift leaves you slightly further away from the wheelchair accessible entrance of the La Sagrada Familia.
The entire Barcelona bus network has been fully wheelchair accessible since 2007. All public buses in Barcelona have driver-operated retractable wheelchair ramps, and dedicated spaces for wheelchair users.
However, nothing beats the perfectly positioned exit of the >La Sagrada Familia Metro station on Line L2.
Except maybe a taxi.
Possibly more expensive though, but a million times more comfortable - so maybe the added expense is really worth it here?
There's no single telephone number to request an accessible taxi in Barcelona though (there are loads of different taxi cab operators in Barcelona - and although they all operate the same distinctive black and yellow cars, they all use different telephone numbers).
One of the biggest taxi operators in Barcelona who have wheelchair accessible taxis though is Taxi Amic (they have 53 accessible Barcelona taxis).
Accessible taxis can be requested directly from a form on their website too, but you still have to confirm this with a telephone call (most of your information will have been sent already though, so the language barrier is minimised).
Your Barcelona hotel should also be able to arrange an accessible taxi for you too though (and will be able to give you a number to call to request a return journey - it may be easier just to arrange a return time at the start though).
NEW: There is a relatively new app that you can use to hail an accessible Barcelona taxi using your mobile phone. And as you don't have to speak to an actual person, there is no language barrier to get in the way at all here. There is an option to only request an accessible taxi.
More "mini-ranks" are being added in 2023 too. The name of the app is AMB Mobilitat (Picmi). Available on both the Google Play & Apple App Stores.