Yes, Ryanair has a 24-hour cancellation policy (+1(808) 751-2262 (USA) or +44 (20) 39003009 (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(808) 751-2262 (USA) or +44 (20) 39003009 (UK).
https://www.devex.com/people/ryr-faqs-is-there-a-24-hour-cancellation-policy-for-ryanair-2275987
