I have just returned from camino, the you can catch the bus to Bayonne train station from right outside airport exit, it will cost one euro and has Bayonne gare on front, I too was concerned about where to catch bus but there was nothing to worry about
Burn camino
Trevor
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon