Courtney Mares shared several videos and photos to her Instagram stories on how fellow passengers were receiving “multiple tornado warnings” as they sat on the plane.
Air traffic control and ground control allegedly evacuated the concourse and the large plane was being shaken by powerful gales.
More than 400 flights were delayed and 60 flights were cancelled at O’Hare, according to data from FlightAware.
Back inside the airport, a video posted to X showed crowds of people waiting around.
“I’m currently at the Chicago airport and we have been asked to shelter in place. I really miss California,” they wrote.
Tornado warnings in Illinois, Indiana and Wisconsin were lifted at 1am, and flash flood warnings were lifted at 4am.
Mares shared another photo of her exiting the plane, followed by a photo in a hotel room at 1.48am. She claimed it took an hour to get a hotel, which ended up being full, so she was sent to another place a 20-minute drive away and finally got to sleep.