Fly from New York to Budapest for $598 round-trip, including all taxes, as part of the current sale from Air Berlin.
We found seats departing JFK on February 14, returning from BUD on February 21. Other dates also available for travel from January 6 through March 30.
You'll find similar deals for travel elsewhere in Europe, departing from other US cities. Tickets must be booked by 6:00pm ET, December 16.