Originally Posted by AA_EXP09

You could also take a bus in Brasil.
Onilinhas
The travel time is >2 days, though for a savings of approximately USD 40, it could be worth it.
Edited: If you want to meet up, I am there for the next 2 weeks.

Originally Posted by VidaNaPraia

That seems a reasonable fare, both the international and the domestic as well, for one way during this time period and for that distance.
(Did I miss the part about what you intend to do for a return flight?)
However, it does bring up the "backpacker problem" (flying into Brazil, leaving Brazil by bus to explore more of the continent) in which the airline will not let someone with a one way ticket board, for fear the passport control people in Brazil will not let the person enter the country without proof that they will leave, and the airline will then be responsible for returning the passenger to the point of departure at the airline's expense. (A bus ticket usually is not accepted; only a booked flight.)