Does Ryanair have 24 hour cancellation policy? There is no universal 24-hour cancellation period for all reservations with Ryanair. In general, Ryanair has tighter cancellation policies than other airlines, and they frequently charge penalties for booking modifications or cancellations. Depending on the type of fare or booking class you have chosen, as well as the specifics of your booking, will determine the specific terms and restrictions for cancellations and adjustments.