Forgetting to check in online with Ryanair can be an expensive mistake, as the airline is famous for its strict adherence to ancillary fee policies. If you arrive at the airport without having checked in online (which usually closes 2 hours before departure), you will be required to pay an Airport Check-in Fee, which as of 2026 is typically around £55 or €55 per passenger. If you have checked in but forgotten to print your boarding pass or do not have it on the mobile app, you may be charged a "Boarding Card Reissue Fee" of approximately £20/€20. To avoid these charges, you must check in via the Ryanair website or app; the window for free check-in usually opens 24 hours before the flight (or 60 days early if you purchased a specific seat). If you miss the online window entirely and show up at the desk, the fee is mandatory and non-negotiable. This policy is part of Ryanair's low-cost business model, which relies on passengers performing their own administrative tasks to keep airport staffing costs and turnaround times at a minimum.