Originally Posted by USAFAN
He wrote that they "did an overnight bus from BsAs to Mendoza", I guess, it took them the whole night.
You may look at
www.lan.com, I have seen some low fares there.
The bus trip to Mendoza takes 14 and half hours. Price range is between
$105 to $180 arg pesos depending on the service. ($US1 about $3.07 arg pesos)
You may find this website usefull:
http://www.plataforma10.com
There you will find many bus companies (not all of them) to all domestic destinations in Argentina and other countries.
As you can see itīs quite a long trip but some of those buses are equipped whith wonderfull full flat bed seats you wish you can see on an aircraft!
I hope this helps you.