Like Angelina, I have never been there with a cover charge. It would depend on the entertainment.
I've been to Skyline many times. And I have never been there when there has been a cover. So to my knowledge there is none. It can change of course. The only suggestion I can make is to call them directly. It may depend on what is on the schedule for the evening. Hope this was helpful!
Thanks! Your answer is awaiting moderation.