Found on travel zoo. Christmas Markets in Cologne good.
Low-cost German airline Germanwings is offering fantastically cheap flights to the cities of Cologne & Stuttgart for just £26 return, including all taxes.
Flights depart from Stansted, with good availability from October onwards and even the odd date in August and September. There is plenty of opportunity to snatch up one of these great low-priced flights for an autumn or winter visit to Germany.
To get the £26 return fare, you need to select an outbound fare of 0.01 and an inbound fare of 1.02 for Cologne and outbound and inbound flights for 0.01 for Stuttgart.