Navigating Chicago O'Hare International Airport (ORD) doesn't have to be overwhelming. As one of the world's busiest aviation hubs, O'Hare handles hundreds of thousands of daily passengers across a sprawling 7.8-square-mile layout. Whether you're connecting between domestic gates or arriving for an international flight, understanding the terminal layout, transit options, and security checkpoints is essential for a smooth journey.
The airport features four active operating terminals—Terminals 1, 2, 3, and 5 (note that Terminal 4 was a former international terminal and is now used for airport bus operations). Terminals 1, 2, and 3 are physically connected post-security, allowing passengers to walk between them without exiting security checkpoints. Terminal 5 stands alone as the primary international gateway and requires a shuttle ride if you're transferring from domestic gates.
Understanding the Terminal Layout
Each terminal at O'Hare serves distinct airlines and functions, making it important to check your boarding pass before arriving.
- Terminal 1: Home to United Airlines and United Express. It features Concourse B and Concourse C, connected by an underground neon-lit moving walkway designed by Michael Hayden.
- Terminal 2: Used by airlines such as Air Canada, Delta Air Lines, and JetBlue. It includes Concourse E and Concourse F. Passengers in Terminal 2 can easily walk into Terminal 1 or Terminal 3 airside.
- Terminal 3: Primarily serves American Airlines, Iberia, and Japan Airlines. It features Concourses G, H, K, and L. This is one of the busiest sections of the airport.
- Terminal 5: The international terminal handling foreign carriers and arriving international flights that require customs clearance. It houses Concourse M. All non-precleared international arrivals clear U.S. Customs and Border Protection here.
How to Transfer Between Terminals
Moving between terminals depends entirely on whether you are staying airside (secure side) or need to exit to the public landside area.
If you are walking between Terminals 1, 2, and 3, follow the overhead signs above the concourses. You won't need to clear security a second time.
If you are transferring to or from Terminal 5, you must use the Airport Transit System (ATS). The ATS is a 24/7 automated people mover that connects all four terminals as well as the Multi-Modal Facility (MMF), rental cars, and economy parking lots. The ride between Terminal 3 and Terminal 5 takes roughly five minutes. Keep in mind that transferring to Terminal 5 from a domestic terminal means you must exit secure areas, ride the ATS, and re-clear TSA security screening.
Ground Transportation and Parking
Getting to and from O'Hare offers several transit choices depending on your budget and schedule.
- Chicago CTA Blue Line: The rapid transit train runs 24/7 from the O'Hare station located in the lower level of the main parking garage. It takes approximately 45 minutes to reach downtown Chicago for a standard fare.
- Ride-Sharing and Taxis: Uber and Lyft pickup zones are designated by terminal on the upper-level departures curbsides. Taxis load on the lower-level arrivals curbsides outside baggage claim.
- Rental Cars: Rental car providers are located off-site at the Multi-Modal Facility. To get there, take the ATS train to the MMF stop.
Security Checkpoints and Insider Tips
Security wait times at O'Hare fluctuate dramatically based on peak banking hours in the morning and late afternoon.
Checkpoints are located in every terminal, but you can enter security at any of the connected domestic terminals (1, 2, or 3) regardless of which one your flight departs from. If the line at Terminal 3 looks overwhelming, walk over to Terminal 1 or 2 to see if queues are shorter, provided you have time.
Frequent travelers should enroll in TSA PreCheck or Global Entry to bypass standard lines. O'Hare features dedicated TSA PreCheck lanes across all active terminals, along with biometric boarding options deployed by major carriers at select gates.
Frequently Asked Questions
How much time do I need for an international connection at O'Hare?
Allow at least two to three hours for international-to-domestic connections. You must deplane, clear passport control and customs, re-check your bags at the transfer desk, ride the ATS to your departure terminal, and go through TSA security screening again.
Can I walk between Terminal 3 and Terminal 5?
No, there is no pedestrian walkway connecting Terminal 5 to the domestic terminals. You must use the Airport Transit System (ATS) train or an authorized shuttle.
Where is the best place to rest during a long layover?
If you don't have airline lounge access, O'Hare offers quiet seating areas near the ends of Concourses C and K. Several airline lounges, including United Clubs and the Delta Sky Club, are available if you hold eligible membership or premium tickets.
What should I do if my checked bag is missing?
Proceed directly to your airline's baggage service office located near the baggage claim carousels. File a delayed baggage report before leaving the airport so you can track your luggage online.
