The people who go on a journey, may not fast. After they leave their homes, they are accepted “travelers” according to Islamic Jurisprudence. But it would be more excellent when the travelers fast. People fast as they wish according to their own condition.

If the travelers intend to stay less than 15 days in that place, they may not fast. But if they intend to stay more than 15 days or learn that they are going to stay more than 15 days then it becomes farz (obligatory).