Core Holidays
Pierre & Vacances Horizon, Benidorm

Price by departure month

Per person, 7 nights, 2 adults — cheapest of ten UK airports. Going in Dec 26 instead of Aug 27 saves £256 per person (46%).
£250£350£450£550£650OctNovDecJanFebMarAprMayJunJulAugSepOctNovDecJanFeb

Dec 26 in Costa Blanca averages a daily high of 17°C with about 3 wet days — £18 per °C, per person.