Terminal layout & organization
Chicago O’Hare International Airport (ORD) is centered around four passenger terminals: Terminal 1, Terminal 2, Terminal 3, and Terminal 5. Terminals 1–3 primarily serve domestic flying (plus select international departures), while Terminal 5 is the main home for international arrivals on non-precleared flights. Each terminal is divided into concourses and gate letters—handy when you’re checking your connection: Terminal 1 uses Concourse B (B1–B24) and Concourse C (C1–C31), Terminal 2 uses Concourse E and Concourse F, Terminal 3 uses Concourse G (plus other concourses), and Terminal 5 uses Concourse M (M1–M40). Airline-wise, Terminal 1 is a major United hub, Terminal 3 is a major American base, Terminal 2 hosts a mix of regional and other carriers, and Terminal 5 concentrates many international airlines.
Navigation between terminals
If you’re connecting among Terminal 1, Terminal 2, and Terminal 3, you can often stay post-security and walk via underground tunnels. Typical walk times are about 10–12 minutes (Terminal 1 ↔ Terminal 2), 8–10 minutes (Terminal 2 ↔ Terminal 3), and 15–20 minutes (Terminal 1 ↔ Terminal 3). For faster terminal hops—or for reaching Terminal 5—use the free Airport Transit System (ATS), which runs 24/7 every 3–5 minutes; most terminal-to-terminal rides take 5–10 minutes and stations are typically accessed from the lower level. During daytime hours, a Terminal Transfer Bus (TTB) may help you avoid re-clearing security on certain transfers; at night you should plan to exit to the ATS and be rescreened. Follow overhead signs for “ATS/Trains,” “Terminal Transfers,” and your gate letter (B/C/E/F/G/M) to confirm you’re heading to the correct concourse.
Traveler-specific tips
- Families: The long connector walks (especially Terminal 1 ↔ Terminal 3) are easier with a stroller—elevators are available at tunnel/ATS access points. If you have time, Terminal 3’s rotunda area is a useful “reset” zone before heading to Concourse G.
- Business travelers: Pick terminals with strong amenities near your gate: Terminal 1 and Terminal 3 have plentiful quick-service dining, while Terminal 3 also has a yoga room (rotunda mezzanine) for a break between meetings or flights.
- Accessibility: ORD’s concourses and the ATS are designed for step-free navigation. If you need wheelchair assistance, request it through your airline early—especially when transferring to Terminal 5, where re-screening may add time.
- Budget travelers: Bring a cable and plan your charging stops. Known charging areas include Terminal 1 (e.g., gates B5, B11, C15, C28), Terminal 2 (E8, F2), Terminal 3 (G13, H12, K12), and Terminal 5 (M13).
Practical information
You’ll find airport Wi‑Fi throughout Terminals 1–3 and Terminal 5; if a signal feels weak, moving closer to the central rotundas and main seating areas typically helps. For help on the fly, look for staffed information desks in the main terminal halls and use posted help phones/assistance points near major junctions and ATS entrances. Power is most reliable at the gate areas noted above—if you’re tight on battery, head there before settling in. Finally, note that Terminal 4 is not a passenger terminal (it functions as a bus depot), so always confirm your terminal number and concourse letter on your boarding pass before you start a transfer.