Here's a great little fare to South America: New York to Montevideo, Uruguay for $374 round-trip, including all taxes, on Copa.
Be warned, seats are scarce. Other dates are available for travel through October, but this is a hidden fare, meaning you may have to do some heavy clicking on the flex search calendar to reveal the lower fare. And there were many dates we spotted that didn't go any lower than $579. Not bad, but no $374. Anyhoo, as seen by the screen shot below, we found seats departing JFK on June 17, returning from Montevideo on June 24.
For booking info, see our Fare Details.