The Vereinigung Cockpit union has hit various Lufthansa units with more than a dozen short-term walkouts over recent months. The dispute centers on the airline's plans to cut transition payments for pilots wanting to retire early, which the union wants to see maintained.
The union announced the latest strike Monday, saying that previous talks made no progress, The Asociated Press reported.
Traditional national carriers such as Germany's biggest airline are being squeezed both by European budget carriers and major Gulf airlines. Lufthansa has announced plans to launch budget long-haul services.