From Longman Dictionary of Contemporary Englishdue toˈdue to preposition 🔊 🔊 BECAUSEbecause of something 🔊 The court of inquiry ruled that the crash was due to pilot error. 🔊 She has been absent from work due to illness. 🔊 The restaurant’s success was due largely to its new manager. 🔊 Attendance at the meeting was small, due in part to (=partly because of) the absence of teachers.RegisterDue to is mostly used in formal or official contexts. In everyday English, people usually use because of:We cancelled the picnic because of the weather.