All-day strikes by Lufthansa cabin crew at three German airports will lead to 929 domestic and international flights being cancelled, the airline has said. The 12.15 pm flight from Frankfurt to Malta is among them.
Lufthansa said some 113,000 passengers will be affected by the action.
The UFO union called on all members to walk out from 4.30am to 11pm local time in Frankfurt and Dusseldorf and until midnight in Munich.
UFO began the strike action on Friday and it is expected to continue for a week, rotating around different airports, though it took a break on Sunday.
The union wants to secure transition payments for its 19,000 members if they retire early as part of its contract dispute with Lufthansa, which is trying to cut costs.
The strikes will not affect Lufthansa subsidiaries such as Eurowings, Germanwings, Swiss and Austrian Airlines.