Ryanair online check-in opens 24 hours before departure when you haven’t reserved a seat, and up to 60 days before departure if you have pre-booked a seat. The check-in window for back-to-back journeys is constrained so both outbound and return flights are within that 60-day window. For airport check- in, the desks generally open at least 2 hours before departure and close 40 minutes before, but this can vary by airport and flight. As of recent changes, Ryanair has moved toward digital boarding passes and online check-in as the standard, with penalties or fees possible for late or non-online check-in. If you’d like, I can tailor this to your specific flight details (dates, route, whether you’ve reserved a seat, and your travel document) and give you the exact check-in window and steps for your itinerary.