The Civil Aviation Authority has begun an enforcement action accusing Ryanair of "persistently misleading" some 715,000 passengers about their legal entitlements, according to its website.
Ryanair must offer them a refund or the option of re-routing, including one with another airline, and tell them how to make a claim for expenses.
The airline faces an investigation after scrapping another 18,000 flights this winter, leading to accusations it had "cancelled Christmas" for 400,000 passengers.
Ryanair said in a press release that the move was made to comply with the Irish Commission for Aviation Regulation rather than the CAA, but said the demands of the two organisations were the same.
The airline will also be responsible for reimbursing the cost difference for any passenger who accepted a refund and then was forced to book a more expensive flight.
Ryanair cancelled up to 50 flights a day through to the end of October, affecting 315,000 passengers.
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Ryanair said: 'We are meeting with the CAA and will comply fully with whatever requirements they ask us to.' Boss Michael O'Leary has faced calls to quit over the fiasco which comes after his company miscalculated holiday rotas for pilots.
Among other complaints, the United Kingdom regulator said Ryanair had repeatedly failed to inform passengers about all the expenses they could reclaim in connection with flight changes. The main reason is to reduce the "risk of further cancellations", which will be eliminated after the airline suspended 2,100 flights during six weeks due to a failure distributing "pilot vacations".
"If anyone has had a flight cancelled - any airline, in this case Ryanair, needs to provide them with an alternative way of getting where they need to go".
"While over 99pc of our 129 million customers will not have been affected by any cancellations or disruptions, we deeply regret any doubt we caused existing customers last week about Ryanair's reliability".
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