JetBlue has a flash sale going on. These are limited-time discounted fares valid for specific flights on specific dates and routes only. They have ridiculously low starting prices, just $20. However there’s only a few fares available for that price. Five to be exact, and they’re very specific indeed.
There’s some other flights available for up to $70, which is still a good deal. See full list of available flights and book directly at JetBlue.com. Act fast! In some cases, a fare may not even last an hour.
Also read this previous post, for a $39 one way fare from NYC to Barbados.