How can I cancel a flight with Ryanair? The rules and regulations regarding cancellation are mentioned in the cancellation policy ryanair. As given in this policy there are several ways of canceling a flight, online as well as offline. The online method includes canceling the flight via the official website of Ryanair and offline methods include canceling the ticket via the customer care helpline or by visiting the office. Either of these approaches can be used by travelers to drop their reservations successfully. How to cancel a Ryanair flight within 24 hours gives you the benefit of a full refund without any additional charges.