The route will operate three times weekly all year round, having been initially restored in March for the summer season only.
Shannon Airport Chief Executive Neil Pakey said the decision provided “an excellent opportunity to boost tourist numbers for the quieter time of the year into this region from Liverpool and vice versa”.
He continued: “Liverpool has the strongest Irish heritage of any English city, even ahead of London, and this, in addition to the outstanding tourism package that we have on the western half of the country, is a real plus for attracting people in for short breaks over the winter.
“It’s a two way street as Liverpool is a great city to visit also. It is, of course, synonymous with football, with Liverpool and Everton both having huge Irish fan bases and a great tradition of Irish players in their squads.”
He concluded: “It has also fast become one of the UK’s leading business destinations so there are strong trade opportunities that we are keen to support.”