To get in on the action you'll need to book by May 11 at midnight when the sale ends, though you'd be wise to jump on the deals earlier as these the fares typically sell out quickly.
As with most JetBlue deals like this, it's worth mentioning that the discounted flights are for "Blue" fares, which means you'll have to pay extra to check a bag ($25 for the first, $35 for the second). Then again, you can probably get away with just a carry-on if you follow the expert's advice. You'll also get the usual JetBlue in-flight perks such as unlimited snacks and free Wi-Fi.
If you miss out on this batch of crazy airfare deals there's still hope for you yet, since JetBlue drops these kinds of sales every single month. In the meantime, if you're feeling wanderlust-y and have a bunch of money to blow, you may want to consider booking yourself on this trip instead.