Thanks, I'l try that.
I did this trip in 2008. The Argentine buses are excellent and efficient. For overnight, I recommend a "semi-cama or Ejecutivo Cama". This will cost you about US$75 I think. They are very safe. Its a long trip. The seats in the "Cama" (means bed in Spanish) are like 1st class air seats. There are two seats on one side of the aisle and only one on the other. There is usually a steward(ess) on board too. Toilets are fine. The buses stop every 5 hours or so at a truck stop type place where you have about 20-30 minutes. Cheesy movies on board and the A/C is cold!
You can catch a plane for just over $100. Both LAN Argentina, Aerolineas Argentinas and Austral flies this route...
And you might get a good fare, if you try to book a Cuzco-Iguazy ticket with a stopover in BA.Edited: 11:48 am, January 23, 2011
It overnight and then some and you would need to take the bus from Puerto de Igauzu in Argentina not from Foz in brazil. . On the plus side the buses in argentina are very comfortable. If you can get a double decker bus and get the front seats on top its quite a nice ride despite taking almost a day and a half.
just tried to book flights, £100 if you are argentinian but £265 if you from the uk, will be going by bus then !!
I second x1achilles! Argentinian buses are excelent.
You can also try the Brazilian company bus PLUMA, cost R$134,50, + or - US$ 63, leave Buenos Aires at 6:30 pm and arrives Iguassu Falls ( Brazilian side) at 12:00 pm.
Another good bus company from Buenos Aires to Puerto Iguazu is Crucero del Norte who offer the cama (bed bus) service for around US$100. From Puerto Iguazu it is only 20 minutes to get to Foz do Iguacu over the border and a lot of Hostel offer tours to the Argentinian Falls with free drop off afterwards in Foz do Iguacu. Lots of options!
Did you end up taking the bus? We're going there in Aug and planning to do the same, but somehow I can not book the bus tickets online for weekends...not sure why.