This research, conducted at the Faculty of English, Hanoi Open University,aimed to explore students’ perceptions of English idioms and the challenges they face incomprehending and using them in spoken English. The study involved 62 undergraduate studentsmajoring in English, and data collection was carried out through a survey. The findings revealthat the majority of the fourth-year students of English recognize the importance and benefitsof idioms in communication. However, these students find English idioms challenging due toseveral factors, including their figurative nature, limited exposure, and cultural or contextualdifferences. Additionally, the study identified specific obstacles to effective idiom usage, suchas limited vocabulary, difficulty in selecting appropriate idiomatic expressions, and fear ofusing idioms incorrectly. These findings hold significance for teachers at the Faculty of English,Hanoi Open University, as they can utilize them to develop targeted and effective teachingmethods that enhance students’ comprehension and usage of idioms in spoken English.