I'm glad you asked. The question of flying after a stroke comes up frequently in my practice, and I'm not sure why.
The bottom line is that the
main risks are that you would be out of contact of medical services for several hours, and that the location you are traveling to may not be equipped to deal with a stroke if one were to occur. Otherwise, there is virtually no reason why a stroke victim would not be able to fly. The oxygen change on the plane is typically not enough to cause any worsening of symptoms.
Therefore, as a general rule, I tell people to wait one week from the time of their stroke (long enough that the chances of a second stroke are very low) before flying.
As always, please check with your doctor just in case there are any special circumstances of which I am unaware.