Sayyiduna Abu Sa‘id Khudri (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: “A woman should not travel for three days or more except with her father, brother, husband, or a close relative (mahram).”
Hadith Referenceسنن دارمي / من كتاب الاستئذان / 2713