Chicago O’Hare International Airport (ORD), located 17 miles northwest of downtown Chicago, is one of the busiest airports in the world. Serving as a global hub for United Airlines and American Airlines, O’Hare connects to more than 200 destinations across North America, Europe, and Asia.

The airport features four terminals (1, 2, 3, and 5) with ongoing modernization projects improving passenger comfort and security efficiency. Terminals 1–3 handle most domestic flights, while Terminal 5 serves as the international gateway with upgraded screening technology and expanded customs facilities.

O’Hare operates multiple TSA checkpoints across its four terminals, each equipped with dedicated TSA PreCheck lanes and CLEAR access.

• Terminal 1 (United): Two main checkpoints with PreCheck.
• Terminal 2: Regional flights and easy corridor connections to other terminals.
• Terminal 3 (American): Busy during peak hours with several expedited lanes.
• Terminal 5: Handles international departures with biometric screening.

Security checkpoints generally open by 3:30 a.m. and close after the final departure, around 11:00 p.m.. Travelers should arrive two hours before domestic and three hours before international flights.

Live TSA wait times are available via traveler updates and airport data, helping passengers choose the best time to arrive and avoid congestion.

When should I arrive at Chicago O’Hare Airport (ORD)?

Which terminal handles international flights at O’Hare?

Does O’Hare Airport have TSA PreCheck and CLEAR?

What are the busiest times at O’Hare Airport?