You can cancel a Ryanair flight by not showing up, +1-888-415-1245 but you will likely not receive a refund unless the flight is cancelled by Ryanair, you experience a significant delay, or in cases of bereavement for immediate family members where you apply for travel credit. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) For most personal cancellations, Ryanair's fares are non-refundable, so your best options are to change the flight to another date or apply for a refund of any government taxes if you did not travel. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK).