As reported here on The Travel Trickster, you can find some seriously cheap flights from New York-JFK or Miami-MIA and Iguazu Falls-IGU:

The Deal

Book flights from New York-JFK or Miami-MIA to Iguazu Falls-IGU for as low as $474 to $524 for travel in January, February or March 2015.

Available travel dates for New York-JFK to Iguazu Falls-IGU in March 2015

By: …your local connection – CC BY-NC-SA 2.0

How to Get It

1. Head to ITA Matrix Airfare Search
2. Use the “See calendar of lowest fares” search functionality and enter a date range of something like 1-8 days, 3-10 days, or 5-12 days etc….
   

   Use the “See calendar of lowest fares option”

3. This search will return a calendar of possible departure dates:
   

   Available travel dates for New York-JFK to Iguazu Falls-IGU in February 2015

4. When you click on a date you’ll be prompted to select the trip length:
   

   Sample dates/prices available for one of the departure dates

5. Once you’ve selected your travel dates, click through to the next screen to see all available flights at that price:

   

6. Unfortunately you cannot book directly from ITA Matrix but now that you’ve found specific travel dates that are valid, head to either Kayak, Orbitz or Expedia to perform a search with the specific travel dates that you honed in on above.
7. Select your flights are you should be all set to book directly from Kayak, Orbitz or Expedia.

Don’t forget: 

• Some people have reported being able to price in a stopover in one of the typical connecting cities such as Lima-LIM, Santiago-SCL etc…
• A few of the booking sites will give you a cancelation window of up to 36 hours, consider booking today before the fares disappear and then canceling tomorrow if you must.

BOTTOM LINE:  This is a great deal to Brazil for the Spring 2015, don’t forget that US citizens will need a visa to visit Brazil.

Featured image source: By: SF Brit – CC BY 2.0