The classical Islamic position, based on hadith, is that a woman should not travel the distance requiring shortening shalat without a mahram — a male relative she cannot marry. This includes her father, brother, son, husband, uncle, nephew, or grandfather. Nabi (shallallahu alaihi wa sallam) said: 'No woman should travel except with a mahram.' However, scholars have differed on whether this applies specifically to Haji when it becomes wajib.
Arab Saudi has progressively relaxed its administrative requirements. Women aged 45 and above can now perform Haji without a mahram if they travel as part of an organized group with other women. Some countries have further relaxed these requirements, allowing women of any adult age to apply for Haji without a mahram, provided they travel with a licensed group.
Among the four schools of jurisprudence, the Shafi'i and Maliki schools allow a woman to perform the wajib Haji without a mahram if she travels with a trustworthy group of women or trustworthy companions, particularly when the obligation of Haji would otherwise go unfulfilled. The Hanafi and Hanbali schools traditionally require a mahram for any journey of this nature. Women should consult their local Haji authority for the most current rules in their country.