Abu Huraira reported God’s messenger as saying, “A woman must not make a journey of a day and a night unless she is accompanied by a man who is within the prohibited degrees.” Bukhari and Muslim.
Reported by At-Tirmidhi (No. 1170). Cited in Mishkat al-Masabih (No. 2515).
"No woman should travel on a two-day-distant journey except with her husband or a Mahram. There should be no fasting on two days: Al-Fitr and Al-Ad'ha. There should be no prayer after the Fajr prayer until the sun rises nor after the ‘Asr prayer until the sun sets. No special journey should be made…
"It is not lawful for a Muslim woman to travel the distance of one night unless accompanied by a man who is a Mahram (non-marriageable male relative) to her."