Same-day rooms on el Camino

closed albergue

I recently received a call from a family that wanted some advice on walking the Camino de Santiago this summer. They had booked their flights into Spain and were going to start walking from St. Jean Pied de Port, walk a few days, then take a train down to Sarria and walk the last 100km. They had read from guide books and forums that it is easy to find overnight accommodations upon arriving at the major towns, even if it is in a crowded albergue (hostel), and they wanted to confirm that this was the case.