Air freight carrier Alitalia is currently offering another set of cheap open-jaw air tickets starting at €295 on the route from Prague to New York and back from New York to Venice. The flights availabilities are very limited and you may find cheap tickets for above mentioned rate from December till the January 2013.
Sample dates I could find
4/12 – 12/12 2012
12/1 – 25/1 2013
18/1 – 29/1 2013 – please see as example below – please check out eDreams.it for availability