Ryanair is expecting that most of its fleet across Europe will be grounded over the next 7 to 10 days.
The airline says in those countries where the fleet is not grounded, social distancing restrictions may make flying impractical, if not, impossible.
In a statement, Ryanair says its seat capacity will be reduced by up to 80% for April and May.
It says a full grounding of the fleet cannot be ruled out.
The airline says it is taking immediate action to reduce operating expenses and improve cash flows.
These include freezing recruitment and discretionary spending, and implementing a series of voluntary leave options, temporarily suspending employment contracts, and significant reductions to working hours and payments.