Norwegian: JFK-OSL (direct) $302 USD return AI JAN/FEB 2016
Awesome price for select (very limited) January/February dates from New York to Oslo Norway. $302 USD roundtrip, tax included. Flights are direct with Norwegian Airlines.
Sample dates include:
Depart: January 22
Return: Jan 29, Feb 2, 4, 5, 7, or 9
Depart: January 29
Return: February 2, 4, 5, 7, or 9
Depart: February 4
Return: February 5, 7, or 9
Book directly with Norwegian Air. I found the above sample dates through Google Flights.