90% of the time that will be fine
by beattherush (2017-09-13 07:36:00)

In reply to: Catching a flight at O'Hare...  posted by goirish912

TSA backs up from time to time but that time of day is usually pretty open.

Traffic can delay you getting in to ORD as well.

Also check in night before and make sure your TSA Pre actually clears.

Normally I'd plan to arrive 2 hours beforehand, but most times you can get away with closer to 75 minutes.