You can find a pretty good size list of departure cities and then you will be able to look and see the destination cities and cost and there are a LOT of cities included! I even see International Flights to all over the world on sale for under $1,000 ROUND TRIP!
This is totally worth checking out if you need to get plane tickets! I looked around and the cheapest flights are on select dates, but it looks like you can get them in a lot of different months, so you have quite a few options! I have no idea how long this sale is going to last, so check it out now while the prices are low!
And check out the One Way JetBlue Flights Sale with Flights As Low As $39!
Photo Credit: By Jules Meulemans – http://www.airliners.net/photo/United-Airlines/Boeing-777-222/1875952/L/, GFDL, https://commons.wikimedia.org/w/index.php?curid=17595855