Fly to Biarritz airport from many airport in the UK and Ireland. For private airport transfers from Biarritz Airport to St Jean Pied de Port then contact Sea-Lifts  or Biarritz Airport Transfers 
Regular train service to Saint-Jean-Pied-de-Port from Bayonne (about 1h20, ticket costs 9€).
Although St Jean Pied de Port is best known as a starting point for the Way of St. James, it also lies along the GR 10, the Grande Randonnée trail that runs from the Atlantic Ocean to the Mediterranean Sea.
Walk. The parts of town frequented by visitors, including the Citadelle and the entire old, walled part of town, are very compact and easily seen on foot.
Begin the Way of St. James (Spanish: El Camino de Santiago, El Camino; Galician: O Camiño de Santiago, Ruta Xacobea; French: Chemin de St-Jacques, German: Jakobsweg)
This is a popular starting point, if not the most popular starting points for those who are beginning the Way of St. James. Referred to as pilgrims or peregrinos in Spanish, many international travelers choose this as the starting point in France that is closest to the Spanish border. Pilgrims will begin by reporting in to the Pilgrim's Office to obtain their credencial to begin their journey.
There are numerous businesses in town that cater to pilgrims, offering overnight rooms, hiking gear, packed lunches, and of course the ubiquitous pilgrim's staff walking sticks.
Walk west, follow the yellow arrows!