Transport

Hi guys , We will be starting our next stage in October from Estella to Burgos , my question is this , as we are flying from Dublin, which is the handiest airport to fly into ? Biarritz or Bilbao?? And any idea how we get from Bilbao to Estella please ? We will finish up In Burgos so I assume it will be easier to get to Bilbao airport! Thank you all in advance