Ryanair's fees for changing passenger details vary significantly based on what you are changing and when you do it. For a full name change (transferring the ticket to a different person), the fee is typically around €115 to €160 ($125 to $175) per person per flight if done online, and even higher if done at the airport or through a call center. However, Ryanair is relatively lenient with minor corrections: you can swap a first and last name for free once within 48 hours of booking. You can also correct minor spelling errors (up to three characters) for free up to 48 hours before departure. If you have married or legally changed your name and have the documentation (like a marriage certificate), the airline will usually update your name for free if you contact their customer service chat. It is always cheaper to make these changes online via the "Manage Booking" section of their website or app, as airport desk fees are notoriously steep for any administrative changes.