You have various options:
1) Train. From Pamplona to Irun. Irun - Hendaye. Hendaye - Bordeaux (aprox 5 hours). See www.raileurope.com.
2) Bus. There is a Eurolines service from Pamplona direct to Bordeaux. The only disadvantage is that it appears to leave in the late evening and arrive in Bordeaux at 3am.
In both options you would need to get a local bus to Pamplona
Thank you, this is very useful
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