You can use the auto-piste from either Donostia-San Sebastián or Vitoria-Gasteiz on the N-I that joins Madrid and Irún. From Bilbao, the AP-8 auto-piste to Bergara, then the GI-632 to Beasain, where you enter the N-I through the GI-2637. And from Pamplona crossing Irurtzun-Ataun (over the Lizarrusti pass), Altsasu-Idiazabal (over the Etxegarate pass) or Altsasu-Zegama (over the Otzaurte pass).
The distances are the following: Donostia 53 km, Gasteiz 73 km and Bilbao around 96 km. The main towns in the area are 7-8 km from Beasain-Ordizia.
By train, the closest RENFE station is in Beasain. Tel. Beasain 943 88 08 53 www.renfe.com
By plane, there are three airports in a radius of 100 kilometres: San Sebastián, Vitoria, and Bilbao.
There are two seaports: Pasaia and Bilbao
Buses, Segura line GO01 https://web.bilmanbus.es/lurraldebus/
Taxis: at the Beasain and Segura train stations
Where to park is shown on the map. And the PDF shows the route cars and buses should follow to drop off visitors and park.