Price comparison: There are a couple of $ 415 RT, nonstop flights on Norwegian Air.
Travel availability:
Departs JFK: wide availability beginning Oct 31 thru Dec 6 and then again Jan 8 thru Mar 2nd
Returns JFK: wide avaiability
Use dates and book it on Expedia [expedia.com], Priceline [priceline.com], Orbitz [orbitz.com], British Airways [britishairways.com] or CheapOAir [cheapoair.com].