Ryanair has cancelled 18,000 more flights, in addition to over 2,000 announced last week.
The new flight cancellations will occur as a result of 25 planes being removed from service from November this year through to March 2018.
Ryanair has made the move to correct an error with the allocation of pilot holiday leave.
It is estimated that 400,000 passengers will be affected by the new round of cancellations.
Ryanair cancelled flights: Martin Lewis revealed to GMB what to do if you’re affected
Martin Lewis said any Ryanair customers who have a flight cancelled won’t be entitled to compensation
Money saving expert Martin Lewis appeared on Good Morning Britain to explain exactly what affected passengers need to do.
Martin said any customers who have a flight cancelled in the new round won’t be entitled to compensation.
He explained: “If you’re given more than two weeks notice of a cancellation, you’re entitled to your money back or an alternative flight. You’re not entitled to compensation.
“Your alternative flight should be with Ryanair but if there isn’t one suitable, you could call them up and say, ‘I want to be booked on another airline.’”
Ryanair cancelled flights: Martin Lewis appeared on Good Morning Britain
It’s this exact issue that has caused the Civil Aviation Authority (CAA) to threaten Ryanair with legal action.
The regulatory body argues the airline has been wrongly telling passengers it won’t re-route them on rival airlines.
Martin said: “If Ryanair refuse, you can try to argue that they should put you on another airline.
“But what is right and what will be done won’t be the same thing. If you can get yourself on another Ryanair flight, it will be easier.”
Ryanair cancelled flights: Passengers affected by the new round can’t claim compensation
Martin also urged affected customers not to panic as the advanced warning should mean passengers have plenty of time to sort out their cancellation.
He said: “It isn’t very easy, but if you’re talking about flying in December, you should be able to sort this out. I wouldn’t panic.”
A total of 34 Ryanair routes will be suspended over the winter period.
Included in this list are London Gatwick to Belfast and London Stansted to Edinburgh and Glasgow.