Flight time from Chicago to O & Hare (ORD) is 1h 17min?

Because it takes so long at this time of day in the week.

On this route, in addition to the almost always heavy traffic (indicated by the red areas on the Google Maps route), there are also frequent job sites, which are often lane reductions.

Also, this moment on Friday is right in the middle of the "rush hour" (an expression that was not accurate in perhaps half a century). Customize the Google options to show a departure tomorrow (Saturday) at the same time or, for example, in the middle of the night on a Tuesday and to reduce the travel time.