SkyTeam and Star Alliance have selected both Vienna to try some cheap fares to the US East Coast this week. The fares seem to be lowest to Philadelphia and Boston, with New York about $100 more.
Vienna, Austria to Boston, $451, Feb 25 – March 10
Vienna, Austria to Cheapoair
Don't expect a lot of miles on these fares, though.
You can use ITA Matrix or Google Flights to find exact dates. Most fares are valid until April 2015.