Act fast, because JetBlue is having a 2-day flash sale!
You can fly from several US cities to both domestic and international destinations (like Turks and Caicos!) starting at just $39 one-way in coach. But the dates and routes are fairly restrictive. And you must book by tomorrow, March 1, 2017.
I found flights from Boston to New York for only $49 one-way in coach. And a flight between Charleston, South Carolina, and New York for just $69 one-way in coach. These fares are valid for departure dates between March 8, 2017, and May 17, 2017.
Here are the details. And how to search for deals from your city!