The itinerary lasts 10hrs 20min, and has 2 steps.

Paris - Bayonne
The step from Paris to Bayonne lasts 9hrs 15min. You'll travel in a INTERCITÉS de nuit operated by SNCF Voyageurs.
On board, you'll have access to: Bike, Wi-Fi.

Bayonne - Saint-Jean-Pied-de-Port
The step from Bayonne to Saint-Jean-Pied-de-Port lasts 1hrs 05min. You'll travel in a regional train.