The UK's Civil Aviation Authority (CAA) wants the firm to tell passengers they're entitled to be re-routed by another carrier and explain how that will work.
Ryanair says it's emailed all customers who've had their flights cancelled to clarify their right to a refund, re-routing on an alternative flight and how to claim expenses.
When asked if it would comply with the CAA's demands by the 5pm deadline, Ryanair said: "We will be meeting with the CAA and will comply fully with whatever requirements they ask us to".
The airline said it will reimburse "reasonable" out of pocket expenses incurred by customers as a result of these flight cancellations, subject to receiving an expense claim form from customers supported by original receipts.
The rights of airline passengers flying with Ryanair Holdings PLC "need to be protected", Ireland's prime minister said Friday, in the wake of the budget carrier cancelling thousands of flights.
Ryanair also announced that from April 2018, when its fleet will increase to 445 aircrafts, they will operate ten fewer planes in order to to ease the pressure on its staff.More news: Students Occupy University of Barcelona to Demand Independence Vote
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Ryanair confirmed yesterday that it is to cancel 22 flights a week to and from Dublin, between November 1 and March 24.
Betting on its confidence of no further cancellations, the airline has rolled out a series of low-fare sales on its winter schedule, but admits the latest wave of axed flights will affect 400,000 customers over a five-month period.
Andrew Haines, chief executive of the CAA, commented: "There are clear laws in place, which are meant to assist passengers in the event of a cancellation".
The CAA has the power to seek legal undertakings from operators to make sure they comply with consumer rights law and to take court action if they fail to do so.
"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".