Yes, Ryanair has a 24-hour cancellation policy (+1-8π8-751-2π62 (USA) or +44-203-900-3009 (UK)). You can cancel within 24 hours of booking for a full refund, provided the cancellation is made at least 7 days before departure. For more details, contact customer service at +1-8π8-751-2π62 (USA) or +44-203-900-3009 (UK).
https://www.devex.com/people/_-_-is-there-a-24-hour-cancellation-policy-for-ryanair-2299598
