AboutVíctor Díaz Expertise I live in Madrid,and travel frequently to Valencia. I have also travelled to many places all over spain, if haven't been there i'd try to help anyway providing my knowledge and links.
I enjoy trekking in the mountains, and know pyrinees, Picos de Europa and mountains in the center.
Question Hi, Many Thanks for your nice volunteer job.
I have a 21 eurail pass and if Bus is necessary we can try that too..BUT HOW LONG WILL IT TAKE.
'1. How do I get to Bilbao from Lourdes
2. How do I get to Bilbao and San Sebastian from Biarritz.
Answer Hello Nimia
By train should be via Hendaya/Irun border towns. From Lourdes to Irun with SNCF trains and then using Spanish trains Renfe to San Sebastian (called Donostia in basque) The same applies from Biarritz.
Irun-San Sebastian by train with Renfe takes 15minutes aprox. http://www.renfe.es/
Irun-Bilbao there is not a direct connection by train and involves doing a lot of km. I recommend buses instead for this trip.
Notice that at the SNCF you can choose Irun (spain) as destination, and at the Renfe site you can choose Hendaye/Hendaya(France) as destination. Renfe don't allow Hendaye as origin of any route.
So i recommend
1-Train or bus to Irun, then bus to Bilbao
2-to Bilbao direct bus with Pesa if it fits your schdule or train to Irun and then bus to Bilbao
2-to SSeb. direct bus with Pesa or train to Irun and then another train with Renfe.