Aer Lingus has cancelled a number of flights today and tomorrow, following cancellations yesterday.
The airline said this weekend's cancellations were due to London Heathrow's mandated capacity reduction, and industrial action at Bordeaux and Lyon airports in France and Pisa airports in Italy.
"Elevated levels of sickness amongst our employees associated with the latest Covid wave" also contributed to yesterday's cancellations, it said.
Return flights between Dublin Airport and Lyon (EI550/EI551) and Bordeaux (EI506/EI507) are cancelled today, as well as a flight from London Heathrow to Cork (EI711).
Tomorrow a return flight between Dublin and Pisa (EI428/EI429) and a flight from London Heathrow to Dublin (EI165) are also cancelled.
Yesterday, another Heathrow flight was cancelled, as were return flights between Dublin Airport and Gatwick in England, Munich in Germany, and Lyon and Bordeaux in France.
The airline apologised to customers affected by the cancellations and said its teams are working to re-accommodate them "as efficiently as possible".