It is not permissible for you to travel without a mahram. This is prohibited by our Prophet salla Allahu alaihi wa sallam.

I am a student who has completed studies. I am now searching for a university, but the fees are skyrocketing! I have always wanted to do medicine and fulfill my beloved parents dream. But my father would not be able to finance my education… …Is it possible for me to go to other countries and study where there is co-education but the fees are a little less? Plus, is it okay for me to travel during holidays home without a mahram? I am sure my father cannot afford to drop and pick me up from university every holiday.