Summer capacity is being raised by Jet2 and Jet2holidays to the green list destinations of Malta, Madeira and Croatia.
Additional flights will run this month and in September from Birmingham, Stansted, Manchester and Newcastle airports.
The increase includes more capacity to Dubrovnik from Stansted and Split in Croatia from Manchester.
The additional flights have been introduced just weeks after more September capacity was added to Malta from Manchester and Stansted, and extra flights to Madeira in September and October from Birmingham, Manchester and Leeds-Bradford airports.
Chief executive Steve Heapy said: “With Malta, Madeira and Croatia remaining on the green list, we are seeing huge summer demand for flights and holidays to these popular sunshine destinations.
“After missing out last year, holidaymakers are in need of a much-deserved break and are booking getaways for this summer.
“In response to that demand, we have added an even greater choice of flights, giving customers and independent travel agents more opportunity to getaway during the months of August and September.
“We are confident that these additional flights will prove popular and will sell very quicky, as customers look to make the most of being able to get away.”