My run is 6 ft tall, and ALL the EEs fly over it!!! Well that is, until they got a wing clipped night before last.
I know mine can fly about 8 ft, cause they rafters in the shed were that tall, and they were flying up there to roost. I lowered them a bit though. Still about 6 ft high, and they get up there OK.
My heavy breeds don't fly as high. They can fly about `1.5ft off the ground and zoom across the yard though!
When we first got our chickens one of our OEGB flew across the yard and onto the roof of our house, plus over our six foot fence. We coverd our run with deer netting so no more chasing chickens. I'm also thinking about clipping wings, I think there is a thread on here somewhere about that.
I have a white leghorn that flys over a seven foot fence on a regular basis. The first run was eight feet tall with wire strung back and forth on top, didn't even think about it. But the run expantion is only seven feet tall with no wire (I ran out). She's up and over that with no problem.
I'm sure that if she was being chased, that little leghorn could clear ten feet!
My SL Wyndotte pullets go over a 10' fence, but none of the other pullets/hens or roosters can manage it. I have RIR, BO, EE, BA, BR, and red sex-links.