Travel from Madrid to Pamplona - how?

A thread from yesterday:
https://community.ricksteves.com/travel-forum/spain/train-itinerary-from-madrid-to-pamplona-then-to-seville

Bus is a great option in Spain for almost any itinerary, for some reason US visitors tend to overlook this option when travelling in Spain. Buses are modern, comfortable, cheap, fast, frequent, clean, safe...and take you almost anywhere!