Good to know about these options, when I did my Camino I didn’t know any better. I did look into flying into Paris, but this was during the Olympics and the fares were astronomical, so Madrid made more sense to me, besides I’m a Spanish speaker so that would made it easier for me, and I didn’t mind the overnight in Pamplona…
…that being said, the bus ride from Pamplona to SJPDP was a nightmare for me because of the hairpin turns through those mountains causing me to have severe motion sickness. I got to SJPDP drenched in cold sweats and having dry heaves. I wish I had been aware of these other options, which brings up the question for me: are the train rides between San Sebastián, Bayonne, and SJPDP more linear (ie, few curves)? I would assume so because after all, this would be on trains, but I’m curious even if I take a bus from San Sebastián, would I get sick from too many curves?