I've been reading this thread and I thought it could be of any help to recommend Vitoria as another alternative option to look for flights and accommodation. There are regular buses to Bilbao and I know a few local travel agencies who are also offering direct coaches to San Mamés from Santander, Vitoria or Pamplona.Accommodation in Bilbao is being a nightmare even for Spanish fans, but trust me, it will be a great experience. Bilbao isn't the prettiest city out there, but the stadium is in the city centre and you'll reach its busiest streets in just 15 minutes by walk.
I didn't find the right solution from the Internet.
References:-http://forum.leinsterfans.com/viewtopic ... 4&start=40Explainer Video Production