Many previous studies have demonstrated that flipped learning has more advantages than traditional learning in the context of teaching ESL (English as a second language) and EFL (English as a foreign language). The present study aimed to directly examine effectiveness of flipped learning on student anxiety, with 61 intermediate level EFL students. The t-test results showed that the levels of foreign language anxiety were significantly lower at the post-test than at the pre-test both in traditional classroom and in flipped classroom. The ANCOVA results showed that flipped learning causes less anxiety than traditional learning does, regarding speaking anxiety, low self-confidence on English ability, native speaker anxiety, and overall anxiety, but not in the case of English test anxiety. These results indicate that flipped learning seems to be preferable to traditional learning when EFL teachers give TOEIC lessons to intermediate level students so as to create low anxiety classroom.