The airline and operator will offer flights and holidays to Bourgas in Bulgaria, serving the popular Black Sea resort of Sunny Beach, from Glasgow and Leeds Bradford airports during the peak summer season.
It will also add more flights to Dubrovnik from Birmingham, Leeds Bradford, Manchester, Stansted and Newcastle, and Split from Birmingham, Leeds Bradford, Manchester and Stansted.
“We know what huge demand there is for green list destinations, so we have made an immediate decision to add thousands of additional seats to Croatia and Bulgaria this summer," said Jet2.com and Jet2holidays chief executive Steve Heapy.