British Airways has added more flights to Greece for their 2019 summer itinerary.
These are the additional routes …

London (Heathrow) – Chania From 22 May to 2 October 2019, an increase from 2 to 3 per week

London (Heathrow) – Kalamata | From April 28 to September 29, 2019, increase from 2 to 3 per week

London (Heathrow) – Preveza | From May 25 to September 29, 2019, an increase from 2 to 3 per week