British Airways has added flights from London to Chania in Crete and Kalamata in the Peloponnese to its summer schedule.
Both routes will start on April 30 and are bookable from today.
Neil Cottrell, British Airways’ head of network planning, said: "We’re delighted to be offering our customers more choices to popular holiday hot-spots.
"We know these new holiday routes are going to prove incredibly popular after increasing our number of flights to Santorini earlier this year and we are pleased we can give our customers an even greater choice of places to get away from it all."
The flights to both destinations will be served by a mixture of A319 and A320 aircraft from Heathrow.
British Airways will be increasing its frequency to Corfu for the summer 2016 season, bringing the total number of flights to the island to six per week.
Flights to Santorini will also increase from three to four flights per week.