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Terminal Connections at O'Hare Airport
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Navigating between O'Hare’s terminals can be challenging, but services like the Terminal Transfer Bus (TTB) and the Airport Transit System (ATS) make it easier. These free transportation options efficiently connect different areas of the airport, though passengers should plan for potential delays, especially during peak hours.
Quick Questions About Terminal Transfers at O'Hare
- What’s the main way to move between terminals? The Airport Transit System (ATS). This free, automated train connects Terminals 1, 2, 3, and 5 with the rental car center (MMF).
- How can I transfer from Terminal 5 without going through security again? Use the Terminal Transfer Bus (TTB). It operates airside (within the secure zone) but only during limited hours (11:30 am – 9:30 pm).
- Can I walk between terminals? Yes, Terminals 1, 2, and 3 are connected via pedestrian walkways. Walking is sometimes faster than waiting for the ATS, especially if you’re not carrying much luggage.
- What’s the biggest issue with the ATS? Its low frequency at night. Although it operates 24/7, wait times can be long during off-peak hours.
Terminal Transfer Bus (TTB)
The Terminal Transfer Bus (TTB) connects the secure areas of Terminal 5 with Terminals 1 and 3 (boarding pass required). It’s especially useful for passengers with connecting flights at gates M1–M40 in Terminal 5, as it allows them to avoid exiting and re-clearing TSA security.
User experience: The TTB is generally reliable and considered a great shortcut. However, its operating hours are limited. Outside the service window (9:30 pm to 11:30 am), passengers must exit the secure area and use the ATS, requiring another round through TSA security. Reviews also warn of potential crowding and delays during peak times.
Travel tip: To avoid missing your connection, always check if the TTB is operating during your travel time and allow extra time for delays, especially during busy periods.
Schedule and Stops
Frequency: every 15 minutes
Hours: daily from 11:30 am to 9:30 pm
Stops: Terminal 1 (Gate B1), Terminal 3 (Gates G17 and K20), and Terminal 5 (Gate M13).
Airport Transit System (ATS)
The Airport Transit System (ATS) is an automated people mover that runs a 3-mile (4.8 km) loop in about 10 minutes. It’s a free service connecting Terminals 1, 2, 3, and 5 with key locations such as the Multi-Modal Facility (MMF) for rental cars, Pace buses, Metra trains, and parking areas.
User experience: While many passengers appreciate the convenience and frequency of the ATS during the day, reviews mention occasional service interruptions due to maintenance, which require slower replacement buses. The main complaint is its low frequency at night, with long and frustrating wait times.
Travel tip: If you're traveling between Terminals 1, 2, and 3 without much luggage, walking may be faster. If using the ATS at night, expect longer waits compared to daytime service.
Hours and Frequency
Operating hours: 24/7
Frequency: every 3–5 minutes during peak hours