The airline is currently only operating less than 20 flights a day, compared with a usual schedule of more than 2,500, while the Covid-19 pandemic sweeps across the world.
It expects most of the fleet to be grounded at least until May.
Ryanair has also suspended share buybacks, frozen recruitment and discretionary spending, and cut all pay by 50% for April and May, including of senior management.
In a trading update released on 3 April, Ryanair said its profit after tax will be at the low end of previous reports at between €950 million and €1,000 million.