None of the 129 people on Flight No. 656 from Phoenix to Chicago were injured, according to the Chicago Fire Department.
"It was a little unsettling when I looked over and we were in the grass," said passenger Lydia McAfee
The passengers were escorted off the plane and then bused to the terminal.
There was no word on the status of their flight.
Between 4 and 9 inches of snow fell Friday night into Saturday morning in the Chicago area.
Click here for more about the winter storm.