Flights departing from Germany operated by Lufthansa’s core airline, its cargo unit Lufthansa Cargo, and regional carrier Lufthansa CityLine could be affected.
The trade union for flight attendants, UFO, refrained from another strike over Easter.
Lufthansa will return to talks with the trade union for flight attendants over their demands for 15 per cent wage hikes and bonuses for about 19,000 flight attendants.
Negotiations are set to resume on Wednesday.
The pilots of Lufthansa subsidiary, Swiss, have withdrawn their threat to strike after an agreement was reached.
