Andorra by bus for one-day excursion from Barcelona Jump to bottom Posted by Justina (Calgary, AB, Canada) on 08/05/08 10:37 AM Hi! I was just wondering which bus line is best(ie. times, cheapest) to use for a one-day trip to Andorra from Barcelona. Also, is it better to book in advance, or when I arrive in Barcelona? Your help is much appreciated! Thanks!