The three first announced their departure on Nov. 12 of last year, but said they would stay on for another six months to ensure a smooth transition.
Walsh denied the early move is because of a conflict of interest.
It was reported that the three were considering starting their own low-cost airline, and critics called for their immediate removal.
Politicians had called on the Irish government to make a decision about the state-run airline’s future.
Irish Transport Minister Martin Cullen issued a statement that said: “A conflict of interest cannot, should not and will not be allowed to arise between their current roles at Aer Lingus and their future career intentions.”
Walsh has remained mum on what he will do upon leaving the airline. He told the Associated Press that “what I do after I leave Aer Lingus is still too early to say.”
Walsh did say he had received more than 40 job offers since announcing his departure, mostly from the aviation industry. He said he was giving 10 of those serious thought.
The three have been busy during their last weeks at Aer Lingus, between dealing with regulatory issues and preparing for the changeover. Help wanted ads from Aer Lingus have already appeared in the Irish Independent newspaper advertising position of chief executive. One of the main requirements listed for the position is for the candidate to build on Aer Lingus’ past successes and continued development as a “successful and innovative low fares airline.” The job description also calls for a candidate who can manage change, development, and growth opportunities.
Walsh took the helm of Aer Lingus in 2000, earning praise for cost-cutting measures that helped the airline reposition itself as a low-fare rival to Ryanair.
Aer Lingus is owned in 85 percent by the Irish government and 15 percent by its staff.