All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
If the distance that you are going to travel alone is not considered as a travel according to the customs [of the country where you live] then there is no harm on you for traveling this distance without a Mahram (a non-marriageable relative).
For more details and benefit, please refer to Fataawa: 87480 and 88562.
Allaah knows best.