By bus
By bus
Several buses to destinations further afield does stop at Chavin around midnight, but then you'll need to have accommodation sorted out ahead.
By bus
The access point for trips to Chavin de Huántar is Huaraz, 3 hours away - on poorly maintained, unpaved road, clinging to the side of a mountain. From Huaraz' bus station there are occasional public buses, but most travelers choose opt to take the easier option, and go with one of the numerous tour groups offering a Chavin itinerary.
Chavin Express
Are the only company offering direct busses, which leaves at 7.30AM, 8.30AM, 11AM and 22PM - fills up quickly so book ahead
Hike
Another option is to go for a beautiful 3 day hike, on a Inca trail, between Olleros south of Huaraz and Chavin, but make sure you hire a guide, from one of the many tour agencies, eg Peru Llama Trek (http://www.perullamatrek.com).