The budget airline said from November passengers would still be allowed to take one “small personal bag” into the cabin for free, as long as it will fit under the seat, but will have to pay the extra charge if they also want to take a 10kg piece of luggage, such as a pull-along suitcase, into the cabin.
Alternatively, passengers will still have to pay £10 if they want to check the bag into the hold instead, with larger check-in luggage costing £25 per bag.
The airline said the move was not aimed at making money, but rather to improve punctuality and reduce boarding gate delays, adding that it had also increased the size of the small carryon bag that remains free to 20 litres.
The current policy allows passengers to take a small personal bag into the cabin, with those who have paid for priority boarding able to take a 10kg bag into the cabin as well.
Those without priority boarding currently take medium-sized luggage with them until they board at the gate, at which point bags are put into the hold free of charge, which means passengers can take two bags without paying extra.
However, Ryanair said this policy was causing delays and from November if passengers turned up at the gate with more than the 20 litre carry-on bag without priority boarding status, the bag would be placed in the hold for a £25 charge.
It is the second time in 2018 that the airline has changed its luggage policy, after instituting the rule on placing the second larger bag in the hold for free in January.
In early-morning trading Friday, Ryanair shares were down 2.3% at 13.5p.