Can anyone point me in the direction of a bus company that does this route? I am struggling to find one! Flintstones, are you out there???

You can book Andesmar online. On their drop down menu, unless they have changed it, they had San Pedro de Atacama as Atacama.

Also, I don't believe the buses go every day, so play with dates a bit. I wish one could edit a post.

Have you checked the info on this website crellston?

http://www.sanpedroatacama.com/ingles/llegar2.htm

Some of these trips you can't book til you're in-country.

My husband went from Iquique to Calama to Salta. He doesn't remember the name of the bus line. He says the trip was punishing tho' it was only 14 or 15 hrs. Spent an hour at the border at 4200m. Everyone was moving like a zombie.

Many thank for the info all.

Huentutu, andesmar do indeed have it as Atacama. No wonder I couldn't find it! Unfortunately their only bus departs at 1.00am..

Thanks for the link mlgb, I will try the alternatives on the site you provided

Thanks for the info Bedar, fortunately, we are well acclimatised so the altitude won't be a problem for us and although 12 hours in bus is no ones idea of heaven, we are used to that too. I am hoping that the scenery will make up for the discomfort, well maybe!