TER train service from Bayonne to Saint Jean Pied de Port is not based on demand but may be rescheduled due to work on the tracks or even workers strikes. If work is being done on the TER line your train may be replaced by a bus. If so the bus and bus ticket will be available at the train station.
Presently there are 5 trains per day at
06:41, 08:50, 14:35, 17:09, 18:35. The journey takes roughly 1 hour 5 min. See
SNCF for more info.
There is no reserved seating on the TER local train from Bayonne to Saint Jean Pied de Port.
The Bayonne station is small with many lit screens showing the track for trains. Usually the TER waits for the passengers from the TGV train from Paris to board before leaving.
Ask any employee for help by showing your ticket.
Good luck and
Bon voyage!