Ten minutes on the ATS often stands between you and your rental car
The Airport Transit System (ATS) at ORD is a free, 24/7 people mover that links Terminals 1, 2, 3, Terminal 5, and the Multi-Modal Facility in about 10–15 minutes end to end. Trains typically show up every 3–5 minutes, so you don’t check a schedule; you just walk up to the platform and board the next one.
If you’re renting from the majors at O’Hare, you’re going to the Multi-Modal Facility on the ATS, not to a curbside shuttle. Almost all big rental brands moved into that single complex, and the only realistic way there from any terminal (1, 2, 3, or 5) is the ATS ride. Count on roughly 5–10 minutes from your terminal platform to the rental counters once you add escalators and walking.
The ATS is fully landside, so you hit it after baggage claim in Terminals 1–3 or after customs in Terminal 5, then follow the signs to “Airport Transit System / Rental Cars / Multi-Modal Facility.” Platforms sit above ground level, and the automated trains run continuously day and night unless there’s a rare outage, with average gaps of around 3–5 minutes when things are working normally.
Peak pain point: evening international banks at Terminal 5, roughly 16:00–21:00, when arriving passengers plus rental returns fill the cars. Riders compare it to Tokyo crowding, with suitcases jammed into the same space. If you’re landing in T5 and connecting to Terminals 1–3, budget an extra 10–15 minutes in case you have to wait for the next train or fight for standing room.
Regulars game the doors. They stand near the ends of the platform or on the side opposite the main crowd flow so they can slide bags into a corner as people exit. Some frequent renters even know which car lines up closest to their preferred company’s escalator inside the Multi-Modal Facility, shaving 1–2 minutes off every trip.
Watch for two common gotchas at the Multi-Modal Facility: the Metra and Pace signs sit off to one side, and new visitors sometimes follow the big rental-car arrows instead, then backtrack several minutes. Also, some travelers still wander around Terminal 1 or 3 looking for old individual rental shuttles that no longer run now that the ATS is back.
Tip: If your connection relies on the ATS, add a 15–20 minute buffer between leaving your gate and reaching the next terminal or the Multi-Modal Facility, especially if you’re landing in Terminal 5 during the evening rush.