A woman has no male guardians (mahrams); is it permissible for her to travel?

The fundamental principle is that it is impermissible for a woman to travel without a mahram, based on clear and authentic proofs. However, if there is a compelling necessity, recognized by Islamic law, that necessitates her travel without a mahram, then there is no harm, because necessities permit the otherwise forbidden. She should not extend her travel beyond what is necessary, and she must take precautions for herself, avoid anything that could lead to fitna, and seek out trustworthy companionship.