Doing a quick search on ITA/LA.com

The RG Flight 2162 is $139 GIG-IGU
and LA 4023 is $80 IGR-AEP
(also TAM flight 705 is $76 AGT-EZE)

total $219

Problem is, RG flight arrives 5:30pm, and LA flight leaves at 2:50.....I'm trying to see if there is any other way to do all the flights in one day....just the timing of things throws it off and having to overnight would in a sense take away any savings you'd get...