The check-in window for a Ryanair flight is very specific and depends on whether you have purchased a seat. If you have reserved a seat (paid for it), you can check in online or via the app from 60 days up to 2 hours before the scheduled departure. If you choose the "Free" random seat allocation, the check-in window is much tighter, opening only 24 hours before the flight and closing 2 hours before takeoff. It is critical to note that Ryanair is famous for its "Airport Check-in Fee," which is currently around £/€55 per passenger. To avoid this, you must check in digitally and have your boarding pass ready on your phone or printed out. If you arrive at the airport and have not checked in, or if you need the desk to print a boarding pass you've already generated, you may be charged a "Boarding Card Reissue Fee" of approximately £/€20. For those traveling with checked bags, the "bag drop" desks usually close strictly 40 minutes before departure. Being even a few minutes late to these digital or physical windows can lead to significant extra costs or a total denial of boarding.