Ryanair is cutting the check-in time window from four days to 48 hours for passengers without reserved seats.
The changes to online check-in will apply from June 13.
However, the European low cost airline leader said the check-in window would still be double that of many rivals.
It will compare to the 24 hour check-in period operated by Aer Lingus, British Airways, Lufthansa, Norwegian and Iberia, according to Ryanair.
The move will give passengers who have paid to reserve their seats more time to pick their place on the aircraft.
Those who pay to reserve seats will be able to check-in up to 60 days before departure.
The change “will give reserve seat customers more time to select their preferred seats prior to departure,” Ryanair said.
“Online check-in for those customers who don’t choose reserved seats will be available from 48 hours to two hours pre-departure for all flights.”
Meanwhile, Ryanair called on the Europe Union to tackle key aviation issues – including travel taxes, ongoing and unjustified air traffic control strikes, lack of competition and artificial capacity constraints – that continue to be prohibit further growth in the low cost airline sector.
The demands coincided with publication of a research project into the impact of budget carriers in Europe in terms of integration and patterns of mobility carried out by the Centre for European Policy Studies.
The report found that low cost carriers play a vital role in bringing Europe closer together by fostering mobility and making air travel affordable to a wider public.
Ryanair chief marketing officer Kenny Jacobs said: “Ryanair welcome the findings of this CEPS report, the objective of which was to understand to what extent low-cost airlines have contributed as well as can contribute to European integration.
“As confirmed by this report, low fares have helped to create a new and growing market for people who would have never travelled before.
“This is connecting and integrating Europe and at the same time creating employment opportunities and increasing tourism expenditure.”