Ryanair’s website and mobile app unavailable from 19.00hrs Wednesday 16 October to 03.00hrs on Thursday 17 October.
Ryanair says that passengers who are due to fly during this period should check-in online before 19.00hrs (GMT) on Wed, 16 October.
In a statement, the airline said it sincerely apologise for any inconvenience caused as a result of this brief downtime.
