Fly from New York to Johannesburg, South Africa for $613 round-trip, including all taxes, on Arik Air.
Seats are scarce, but we found seats available throughout fall, starting in late October (I searched Oct. 22 - Nov. 2, as seen below). Booking is a tad tricky, since the Arik site doesn't allow you to search New York to Johannesburg unless you use their multiple destination search, entering Lagos, Nigeria as the connecting city. You can avoid all that by just using Kayak, OneTravel, or CheapoAir. I went from Kayak's "Explore" feature and was directed to Arik where I was able to bypass that whole multiple destination step.