Ryanair is to scrap nine routes out of London, Stockholm and Frankfurt in the New Year and replace them with nine other routes.
In a statement issued this morning, the company said four news routes from London, two from Brussels and Sotckholm and one from Frankfurt would start operating early in the New year.
Amongst the cuts would be routes between the Finnish city of Tampere and Sweden's Skavsta airport due to weak demand and their replacement with a route from Frankfort to Tampere.
Mr O'Leary also reiterated his call on the European Commission to rule in favour of Ryanair's deal at Brussels Charleroi.
He said he remained hopeful that the Commission would recognise the benefits of the Charleroi service for Belgian consumers and visitors.
'Low fares are serving the needs of consumers and helping to develop under utilised secondary and regional airports. "We call on the Commission to rule in favour of Brussels Charleroi", he said.