"The board of Ryanair Holdings plc today confirmed that it has voted unanimously to accept the IAG offer for Ryanair's 29.8 per cent shareholding in Aer Lingus Group plc," it announced in a statement.
"The board believes that the current IAG offer maximises Ryanair shareholder value."
Also Read
IAG, parent of British Airways and Iberia, has made a takeover bid valuing Aer Lingus at a total of 1.4 billion euros (USD 1.5 billion) and had secured the sale of the Irish government's 25-per cent holding in May.
"We believe the IAG offer for Aer Lingus is a reasonable one in the current market and we plan to accept it, in the best interests of Ryanair shareholders," said Ryanair Chief Executive Michael O'Leary in the statement.
"The price means that Ryanair will make a small profit on its investment in Aer Lingus over the past nine years."
The deal offers Aer Lingus shareholders 2.55 euros per share - comprising 2.50 euros plus a 0.05 euro cash dividend.
Ryanair itself had previously launched three unsuccessful takeover attempts for Aer Lingus.
British regulators had ordered Ryanair to cut its stake in Aer Lingus to just five percent on grounds of unfair competition.