It's dead easy on the bus, quite a few stops but really obvious when you get to the city. We went around 2pm so still had a good half day skiing, but plenty of time to explore and have dinner in Andorra la Vella.
Thank you Ellen, that's really helpful.
Thanks for your post. You can get to Caldea Spa in Andorra la Vella via the L4 bus which leaves Pas de la Casa from the Main Bus Stop (outside the church.) See map here: pasdelacasa.com/map-pas
The bus costs €6.10 each way and they run around every 20 minutes to half hour (although they aren't always on time so it's best to allow yourself plenty of time before you need to be there.)
You can find out more information about getting to Andorra la Vella here: pasdelacasa.com/shopping/
I hope this helps but please let me know if you have any questions.
I want to visit Caldea in Andorra la Vella. Please can you tell me the best way of getting there? Presumably on the bus??
Also the price?