Tango your way on over to Argentina this December! Fly from New York-JFK to Buenos Aires for $608 roundtrip on LATAM. Flights to B.A. don't go on sale very often, and this price is well below the average rate and much lower than from anywhere else in North America.
Searching third-party sites such as Expedia, I found seats departing New York JFK on Sunday, December 2, returning from Buenos Aires EZE on Monday, December 10, 2018. This fare is only valid during a small travel window in early December, so you'll have to look in that period for this price point.
See our fare details for booking info.
If Brazil is more on your samba style, you can also fly nonstop from New York to Sao Paulo for $514 roundtrip during the same period.
Need a room in Buenos Aires? Here's what's available for the above dates on Hotelwatchdog.