Hello @joy917, I would like to add my welcome to Connect along with @SusanEllen66 and others. I agree with Susan about discussing the question with your doctor. I did find the following information on your question but hoping others with experience will also respond.

"How long before I can fly?
It is strongly advised that you seek your doctor’s advice on whether they believe that you’re fit to fly, before booking any travel arrangements. You should also speak to your airline. There are no specific guidelines regarding the minimum time before you can fly. However, the , which is responsible for air travel safety, advise that you should avoid air travel for approximately seven to ten days following brain surgery. The general advice from the NHS is to wait until around 6 weeks from your operation and you’ve made a full recovery from your treatment before flying. You can find more information on our page."
-- Going home after brain surgery: https://www.thebraintumourcharity.org/brain-tumour-diagnosis-treatment/treating-brain-tumours/adult-treatments/neurosurgery-adults/going-home-after-surgery-brain-tumour/

There are also a couple of related discussions that you might want to look at:
-- Time for surgery: Questions about travelling home after brain surgery https://connect.mayoclinic.org/discussion/time-for-surgery/
-- Is it safe to fly with a brain tumor? https://connect.mayoclinic.org/discussion/is-it-safe-to-fly-with-a-brain-tumor/