Narrated Abu Huraira: The Prophet (p.b.u.h) said, "It is not permissible for a woman who believes in Allah and the Last Day to travel for one day and night except with a Mahram."
Hadith ReferenceSahih Bukhari / The Book of Abridged Or Shortened Prayers (At-Taqsir) / Hadith: 1088
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة