Ryanair has published a list of flights cancelled up to Saturday 28 October on its website.
Over 200 flights have been cancelled from this Thursday until Sunday.
Details of cancellations from Monday 25 September to Saturday 28 October on its website were published earlier this evening.
Flight cancellations had already been published for tomorrow and Wednesday.
Dublin Airport is the only Irish airport affected by the cancellations so far, with up to six flights at the airport cancelled each day from Monday 25 September.
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Ryanair Chief Executive Michael O'Leary has said all passengers affected by the cancellations will be entitled to a place on an alternative flight or a full refund.
Speaking at a news conference at the airline's headquarters in Swords, Co Dublin this afternoon, Mr O'Leary apologised for the airline's flight cancellations, which began last week.
Mr O'Leary said 50 flights a day will be cancelled for the next six weeks because punctuality has fallen to around 70%.
He said that the company has finalised its list of flight cancellations to 31 October and will be informing affected customer by email this evening.
Michael O’Leary says all customers on affected Ryanair flights will receive email today offering an alternative flight or a full refund pic.twitter.com/BMeAz2f5N6
— RTÉ News (@rtenews) September 18, 2017
Mr O'Leary said the airline is trying to allocate, from 1 September, a large amount of annual leave, principally to Ryanair pilots.
"We are not short of pilots. What we have messed up is the allocation of holidays. We don't have enough stand-by coverage to cover the inevitable disruptions that happen - air traffic control disruption and weather."
"We don't have enough pilots in September and October to allocate the leave."
"As we take disruptions - eg thunder storms this weekend in Barcelona - and as crew and aircraft get stuck, there are no back-up crews available."
"We need to take out about 50 flights a day over the next six weeks while we have these crewing issues."
Ryanair chief Michael O’Leary says blame for flight cancellations lies with company following changes to how it manages leave pic.twitter.com/EuDROTvkJE
— RTÉ News (@rtenews) September 18, 2017
Read more:
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"Over the weekend and today, we have finalised a list of cancellations. We are trying to cancel flights on busy routes where we can offer passengers a choice of alternatives."
"We will be issuing emails to all customers this evening as well as updates on social media."
"This is a large number of flight cancellations, but amounts to less than 2% of our flying programme."
Michael O’Leary says a list of Ryanair cancellations has been finalised to the end of October which will focus on busier airports and routes pic.twitter.com/ZcKjjDxMJ4
— RTÉ News (@rtenews) September 18, 2017
"98% of flights and customers will not be affected. This decision minimises delays and cancellations because of crew leave issues."
Mr O'Leary said the cancellations will cost the company "around €5m over the next six weeks and compensation of up to €30m".
Michael O’Leary says Ryanair will not be paying for flights on other airlines for customers affected by flight cancellations pic.twitter.com/pzqMT42N0e
— RTÉ News (@rtenews) September 18, 2017
He said that while customers would be offered a full refund or a place on an alternative flight, Ryanair would not be paying for flights on other airlines.
He also apologised to customers who were "unnecessarily worried over the weekend".
Mr O'Leary denied claims that the airline is short of pilots, saying that while some pilots have left to join Norwegian Airlines, Ryanair has also recruited pilots from Norwegian.