The claim stems from an investigation by consumer champion MoneySavingExpert (MSE), which found some holidaymakers who booked trips for 2021 were told they could only fly if they returned the original refunds.
MSE spoke to three passengers who claimed they were told they could not fly until they gave the money back, with amounts reportedly ranging from £400 to £630.
In response to the accusations, a Ryanair spokesperson said: "Ryanair flights that operate as scheduled are non-refundable – this is clearly outlined in Ryanair’s T&Cs agreed by the customer at the time of booking."