It is not lawful for a woman who believes in Allah and the Hereafter to undertake a day's journey except in the company of a Mahram.
عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تُسَافِرُ مَسِيرَةَ يَوْمٍ إِلاَّ مَعَ ذِي مَحْرَمٍ