Oral communication is a central aspect of language learning in EFL-classrooms all over the world. Therefore, problems arise when students are passive, or unwilling to communicate and participate. The aim of this study is to investigate what factors impact Swedish upper secondary students’ willingness to communicate using self-reported data. The data in the study is gathered from a questionnaire with 203 participants currently studying in Swedish upper secondary school. The data analysis comprised inferential statistics to investigate causal relationships between the concepts of foreign language anxiety (FLA), self-perceived communicative competence (SPCC), extramural English (EE), and willingness to communicate (WTC). The results of the study suggest a causal relationship between the concepts, thus contributing to previous studies on factors that impact and describe willingness to communicate. Also, the results indicate that students’ extramural English habits impact their behavior in oral communication. In conclusion, motivating the utility of the English language for real-world purposes, in combination with a positive classroom environment, and the improvement of students’ oral communication confidence are imperative tools for the stimulation of willingness to communicate in the EFL classroom.