Throughout the year, Lufthansa will occasionally run a fare sale where they allocate a million tickets at discounted prices for travel within Germany and Europe.
In the latest version, the deal runs this through weekend (between now and 22 February) and is valid for travel between April and September.
From what I see fares are about €10-€40 lower than usual so it makes for a compelling fare sale. Keep in mind that the sale expires midnight CET on 22 February or when 1 million tickets have been issued from this promo.
The terms of the fare sale are as follows:
Departures need to take place between 1 April and 30 June, 2015.
Returns need to take place between 2 April and 30 September, 2015.
Minimum Stay Requirements: 1 night for German destinations. For all other destinations it is one of the following: 3 nights OR a Friday Night OR a Saturday night stay.
Maximum Stay: 3 Months.