The aims of this study were to determine the suitable sunflower cultivar (Giza-102 and Sakha-53) under North Sinai conditions that gave optimum seed yield and fatty acid composition in relation to planting dates (30^th April, 30^th May and 30^th June) and irrigation requirements (50%, 75%, 100% IR). Experiment was carried out during 2018 and 2019 seasons, at the farm of the Fac. Environ. Agric. Sci., Arish Univ., North Sinai, Egypt. Results refers that oil yield was increased as sowing date early beyond the 30^th of April. Also, the healthier oils with high unsaturated fatty acids (UFA) and low total saturated fatty acids (TSFA) recorded with 30^th April planting date. But delayed to June 30^th planting date treatment achieved the highest averages of TSFA (%). Full irrigation requirement treatment was achieving higher economical seed and oil yields. Meanwhile, reduce water to 50% IR treatment is suitable for development sunflower oils with high USFA (%) and low TSFA (%). Sakha 53 sunflower cultivar produced significantly higher plant seed and oil yields than Giza 102. Generally, data revealed that planting sunflower cv. Sakha 53 on end-April using 100% IR followed by 75% IR irrigation treatments gave the highest seed yield and oil components. On the contrary, sown Giza 102 or Sakha 53 plants on June 30 and irrigated with 50% IR gave the lowest values in 1^st and 2^nd seasons.