Ryanair’s website and mobile app will go offline for five hours from tomorrow evening, affecting users’ ability to check in to flights or make new bookings.

The airline said it would undertake a systems upgrade of its online service from 9pm on Tuesday, 11 August until 2am on Wednesday morning.

During this time it will not be possible for existing customers to check in to their flight, or for other users to make new bookings.

The airline has advised those travelling on Ryanair flights around this time to check in for their flight today in order to avoid any issues when flying.