Haha, just kidding, you can't. Midway is completely closed until at least 4pm, and delays at O'Hare are currently averaging over 2 hours and more than 300 flights have been canceled.
Hear that? That was the sound of thousands of travelers all saying "blerg" at the exact same moment. [FAA, Trib]
Hopefully the folks at O'Hare and Midway could understand. It was CRAZY dark downtown at 12:30pm today. That's how bad the fog was. All day the fog covered everything in sight.
I'd never seen anything like it.