Virgin America, Jetblue Airways and Delta Airlines have roundtrip airfares travelling to and from Las Vegas (LAS) and New York (JFK) for $226 including taxes and fees. This is nonstop service.
Travel Availability:
Departs JFK: Sept 2, 3, 9, 25, 26; Oct 14, 17, 23, 24, 31; Nov 2, 4, 30; Dec 2, 3, 5, 7, 9, 10
Departs LAS: Sept 13, 20, 21; Oct 5, 18, 19, 24, 26; Nov 1, 2, 4, 29, 30; Dec 2, 5, 6, 7, 9
Use those dates and plug into Orbitz , CheapOAir , Expedia , or Priceline , to see which airline is flying on your choice of dates.