How do I get from San Sebastian to Pamplona during the San Fermin festival?
You would really be better staying overnight on the night before … so why not make it an overnight excursion, that way RENFE will work out fine. If you absolutely can’t stand the idea of staying in the beautiful medieval town of Pamplona overnight, then you could look on BusStation.net or the other sites I have put below that will give you information. You can also call the tourist office in Pamplona (+34 / 948 42 04 20) or in San Sebastien (+34 / 943 48 11 66) Happy running, I did it once, and it was a high adrenaline experience being surrounded by thousands of drunken idiots showing how ‘tough’ they were (plus the locals who were not drunk, and the ones who take it a little more seriously)!