Shaykh Jamir Meah is asked if a wife can perform umra without her husband present.
I want to perform umra with my husband and children but he drinks alcohol so can I perform umra by myself? He can only travel with me and stay in the hotel while I go and do my umra.
In the Shafi‘i school it is permissible for a woman to travel alone to perform her obligatory hajj and umra. The permissibility to travel alone only applies to obligatory (first time) pilgrimages, and not sunna pilgrimages. (Bushra al-Karim)
If your husband travels with you and stays in the hotel, this would suffice in regards you traveling with a mahram, even if he ordinarily sins. Perhaps you could ask him to at least refrain from drinking to and during the trip out of respect, if you feel comfortable or safe enough to ask him.
Alternatively, you may ask another mahram to escort you, such as your father, adult brother, adult son, uncle etc.
You may also find the following answer helpful for your situation: My Husband Is Not Practicing: What Can I Do To Make Him A Better Muslim?
I wish you all the best.
Checked and approved by Shaykh Faraz Rabbani.