Almost 200,000 seats are on sale as British Airways raises UK regional capacity from five regional airports by 26% over last summer.
New routes include Manchester and Edinburgh to Florence and Manchester to Dublin in addition to extra capacity to the continent from other UK airports.
Services to Malaga and Palma have doubled from Manchester and there is increased frequency to Nice and Ibiza.
Extra flights have also been scheduled to Florence and Palma from Birmingham; to Malaga, Ibiza and Palma from Bristol and to Milan, Nice and Florence from Stansted.
Two new Embraer 190 regional jets are supporting the expansion.
One-way fares from Manchester to Dublin start at £26, Birmingham to Palma from £44 and Bristol to Malaga from £44.
BA general manager customer and commercial Luke Hayhoe said: “We are growing our summer schedule from five regional airports to destinations that our customers tell us they want to fly to.
“Last year we almost doubled the number of routes we operated and this year we continue to add even more destinations and an additional 36,000 seats from the UK regions.”
Additionally, a twice-weekly summer service from Heathrow Terminal 5 to Kefalonia in Greece starts on May 15 and runs until October 6.