How durable is the flash?

If flash were to get shot per say, would it affect him like it would affect a normal human or what?

This has always been unclear thanks.

It would heal almost instantaneously.

Depends on where he's shot.

He could just take all it's speed and make it fall in slow motion doing no damage. I think there was a moment when an assassin shot him in the back of the neck and the moment he felt it the speed force kicked in and he dodged it.

One does not simply shoot the Flash

He will vibrate enough so that the bullet drops right through him.