Answer
Travel from San Sebastian to Paris via Gare de Hendaye
Best answer by ralderton
Seat61 is always the best for this sort of thing:
https://www.seat61.com/Spain.htm#london-to-san-sebastian-by-train
It will be TGV to Hendaye, then Euskotren (local ‘metro’ - not included if you’re using Interrail pass) to San Sebastián. As long as you leave on the 1211 or earlier train from Paris, you can reach San Sebastián the same day.
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