Core Holidays
Grecotel Casa Paradiso, Marmari

Price by departure month

Per person, 7 nights, 2 adults — cheapest of ten UK airports. Going in May 27 instead of Aug 27 saves £456 per person (43%).
£500£650£800£950£1,100MayJunJulAugSepOct

May 27 in Kos averages a daily high of 23°C with about 4 wet days — £26 per °C, per person.