Chicago O’Hare International Airport (ORD) stands as one of the world’s premier aviation hubs and a major gateway to the United States Midwest. Serving as a primary hub for both United Airlines and American Airlines, ORD connects millions of travelers each year to over 200 non-stop domestic and international destinations across Europe, Asia, the Americas, and the Middle East.
Whether you're visiting the Windy City, transferring between domestic flights, or embarking on a long-haul international journey, understanding Chicago O'Hare Airport terminal navigation and ground transport is key to an effortless travel experience. Located approximately 17 miles (27 km) northwest of downtown Chicago, ORD features four active passenger terminals: Terminals 1, 2, 3, and 5.
This ultimate travel guide covers everything you need to know about navigating O'Hare International Airport, including airside terminal transfers, the 24/7 automated Airport Transit System (ATS), CTA Blue Line train connections, TSA PreCheck, VIP lounges, and practical layover tips.
| Chicago O’Hare International Airport (ORD) Navigation at a Glance | |
|---|---|
| Airport Code | Chicago O'Hare International Airport (ORD) |
| Terminal Layout | 4 Active Terminals: Domestic Terminals 1, 2, 3 and International Terminal 5 |
| Primary Transit Options | Automated Airport Transit System (ATS), Terminal Transfer Bus (TTB), CTA Blue Line Train, Metra, and Rideshare/Taxis |
| ATS People Mover Time | 10 minutes total route travel time connecting T1, T2, T3, T5, and the Multi-Modal Facility (MMF) |
| Immigration & Customs | Centralized U.S. Customs and Border Protection (CBP) facility at Terminal 5; Mobile Passport Control & Global Entry available |
| Best For | Transcontinental U.S. connections, Midwest business travel, Star Alliance & Oneworld airline transfers |
Quick Answer
Chicago O'Hare consists of four active terminals (Terminals 1, 2, 3, and 5). Terminals 1–3 are connected airside via pedestrian corridors, allowing secure transfers without re-clearing security. However, Terminal 5 is physically separate. To move landside between Terminals 1–3, Terminal 5, and the rental car Multi-Modal Facility (MMF), take the free 24/7 Airport Transit System (ATS) train. Airside transfer buses (Terminal Transfer Bus) are also available for connecting passengers with valid gate passes.
Understanding the Layout: ORD's T1, T2, T3 & T5 Design
Chicago O'Hare operates on a semi-circular terminal layout for its domestic facilities (Terminals 1, 2, and 3), while Terminal 5 sits across the airfield as the primary international terminal hub.
All terminals feature dedicated departures levels (upper tier) and baggage claim arrivals halls (lower tier). Standard pedestrian walkways link Terminals 1 through 3 behind TSA security checkpoints.
Airport Transit System (ATS)
Free 24/7 automated train connecting T1, T2, T3, T5, and the Multi-Modal Facility every 3–5 minutes.
CTA Blue Line Train
24/7 direct CTA train from O'Hare Station (Terminal 2) to Downtown Chicago (The Loop) in 45 mins.
Multi-Modal Facility (MMF)
Centralized hub for all rental cars, Economy Lot F parking, Metra trains, and regional buses.
TSA PreCheck & CLEAR
Priority security screening lanes available in Terminals 1, 2, 3, and 5 for eligible travelers.
Terminals & Airline Breakdown
Identifying your terminal and concourse before arriving at Chicago O'Hare saves valuable time:
| Terminal Zone | Primary Usage & Carriers | Concourses & Gates | Key Highlights |
|---|---|---|---|
| Terminal 1 | United Airlines (Hub), United Express, Lufthansa, ANA | Concourse B & C (54 Gates) | Features the iconic neon neon-lit underground tunnel connecting Concourses B and C; multiple United Clubs. |
| Terminal 2 | Air Canada, JetBlue, Alaska Airlines, select United Express flights | Concourse E & F (41 Gates) | Houses the CTA Blue Line subway station entrance and family-friendly lounge lounges. |
| Terminal 3 | American Airlines (Hub), American Eagle, Spirit, Iberia, British Airways (departures) | Concourse G, H, K, L (75+ Gates) | Large domestic hub with Flagship Lounge, yoga room, and extensive dining corridors. |
| Terminal 5 | Primary International Gateway & Delta Air Lines, Southwest, Emirates, Qatar Airways, Etihad | Concourse M (36 Gates) | State-of-the-art international facility with duty-free luxury shops and customs clearance checkpoints. |
Good to Know: International Arrivals
Most international flights arriving at O'Hare land at Terminal 5 to process U.S. Customs and Border Protection. Even if your departing international flight leaves from Terminal 1 or 3 (e.g., United or American), your inbound international flight will likely disembark at Terminal 5, requiring you to collect checked baggage, clear customs, and take the ATS people mover to your onward terminal.
Getting Around ORD: Transport & Distances
Chicago O'Hare offers rapid ground transportation options linking all airport facilities and downtown Chicago:
Airport Transit System (ATS) & City Rail
Primary Mode of Transfer Between Terminals & Parking- ATS People Mover: Free automated light-rail train running 24/7 between T1, T2, T3, T5, and MMF every 3–5 minutes.
- Total Track Distance: 3 miles with a maximum trip duration of 10 minutes from T1 to the MMF.
- Terminal Transfer Bus (TTB): Airside transfer bus serving passengers connecting between domestic T1/T3 and T5.
- CTA Blue Line: Direct 24/7 subway line departing from lower level of T2 to downtown Chicago (The Loop).
- Metra North Central Service: Commuter rail station at the Multi-Modal Facility connecting to Union Station.
- Rideshare & Taxis: Uber/Lyft pickup zones located at T2 (Lower Level) and T3 (Upper Level).
Accessibility & Passenger Amenities
O'Hare International Airport provides comprehensive amenities to keep passengers comfortable during layovers:
Airline Lounges
United Clubs (T1/T2), American Admirals Clubs (T3), Delta Sky Club (T5), and SAS Lounge.
Pet Relief & Care
Dedicated indoor service animal and pet relief areas located in each terminal.
Mother's Rooms
Private lactation suites and nursing pods positioned across all concourses.
Hilton Chicago O'Hare
Full-service hotel directly connected via underground concourse to Terminals 1, 2, and 3.
Step-by-Step Transfer Guide
Follow these steps to navigate your connection at O'Hare smoothly based on your arrival route:
How to Transfer Between Flights at ORD
Verify Gate Info
Check display screens upon arrival to confirm your onward terminal (T1, T2, T3, or T5).
Check Security Status
For T1-T3 connections, walk airside. For T5 connections, use the TTB airside bus or exit to ATS.
Board ATS / Shuttle
If changing landside, board the free 24/7 ATS train to reach your destination terminal.
Clear TSA / Board
Re-enter TSA security (using TSA PreCheck if enrolled) and proceed to your departing gate.
Transfer Requirements Summary
| Transfer Route | Security Clearance Needed? | Recommended Minimum Buffer Time |
|---|---|---|
| Domestic to Domestic (Within T1, T2, or T3) | No (Airside pedestrian walkways connected) | 45 to 60 minutes minimum |
| Domestic to International (T1/T2/T3 to T5) | No if using Terminal Transfer Bus (TTB); Yes if taking ATS train | 90 minutes minimum |
| International to Domestic (T5 Arrival to T1/T2/T3 Departure) | Yes (Must clear U.S. Customs, recheck bags, and take ATS train) | 2.5 to 3 hours minimum |
