There is no charge forcheck-in at IbeiraAirport. On European flights, check-in starts 2 hours and ends 40 minutes before departure, while on long-haul flights, check-in is usually 3 hours before departure.
Online check-in, including mobile check-in, is available 1-24 hours before departure. Either print your boarding pass or leave it on your mobile phone and scan the barcode at the airport (may not be possible at all airports).