Ryanair will fly twice a week from Shannon to the Spanish holiday island of Ibiza and East Midlands Airport in Britain between now and October.
The airline will begin services to both destinations from the mid western airport this week, adding a potential 43,000 extra passengers to traffic through there this year.
Ryanair will fly to Ibiza, the best-known of the Balearic Islands in the Mediterranean, on Wednesday and Sunday from now until the end of October.
The airline will serve East Midlands Airport, close to Leceistershire, Nottingham and Donnington motor racing track, in England, on Mondays and Fridays.
Andrew Murphy, Shannon Airport managing director, welcomed the news. He said Ibiza was a "brilliant" addition to its summer sun schedule.
Mr Murphy described East Midlands Airport as the “gateway to a really interesting part of the UK”.