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If you download the Priority Pass app or Lounge Buddy app, it will show you all the lounge options at any airport.
Unfortunately, at O’Hare there is only 1 Priority Pass Lounge and it is in the International Terminal 5.
You also can’t access it after 3pm because Business Class passengers use it for other airlines and they won’t let you in.
https://www.prioritypass.com/lounges/usa/chicago-il-o-hare-intl
prioritypass.com
Chicago IL O Hare Intl ORD Lounges - ORD Airport Guide and lounges. | Priority Pass
With several lounges at Chicago IL O Hare Intl Priority Pass customers can refuel, refresh and reconnect before the flight.