Super cheap flights from many US cities to Europe from only $69 one-way.
Also works in reverse (from €129 one-way).
Washington DC/Boston/San Francisco/Miami/Los Angeles/Detroit/Cleveland/Cincinnati/St. Louis/Pittsburgh, USA
Availability from January to May 2018
The WOW Air website conveniently allows you to view prices for the whole month so there is no need for a list of example dates from us.