Generally, no, a science GCSE is not a mandatory requirement to become a flight attendant in 2026. Most airlines in the UK and internationally focus on a foundation of at least 5 GCSEs at grades 9-4 (A*-C), but the non-negotiables are almost always English and Maths. These are required to ensure you can communicate safety instructions clearly and handle basic financial transactions or weight-and-balance calculations. While a science GCSE isn't required, it can be beneficial as it demonstrates an ability to understand the technical and medical principles taught during your 6-8 week intensive training—such as the effects of cabin pressure on the body or basic first aid. Most airlines value "soft skills" and customer service experience far more than a specific science qualification. If you have the required English and Maths grades, along with a professional attitude and the ability to swim, you are eligible to apply.