Terminal 1
Concourses B and C. The Airport Transit System stops at Terminal 1, and on the secure side Terminal 1 has pedestrian connections to Terminal 2 and Terminal 3. The Terminal Transfer Bus to Terminal 5 leaves from Gate C18B.
Chicago, Illinois Independent airport guide
Chicago O’Hare International Airport serves Chicago from the city’s Northwest Side.

How early to get to O'HareNo arrive-by time for domestic flights, only checkpoint hours. Checkpoint 10 in Terminal 5 never closes.
Which O'Hare checkpoint to useTerminal 1 uses 1, 2 and 3, Terminal 2 uses 5, Terminal 3 uses 6, 7, 7A and 8, Terminal 5 uses 10.
O'Hare terminals explainedB and C are in Terminal 1, E and F in 2, G, H, K and L in 3, M in 5. How to read a gate number.
How long to connect at O'HareNo minimum connection time. Terminals 1 to 3 connect behind security, Terminal 5 by train or bus.
O'Hare to downtown ChicagoThe Blue Line, a taxi, a shared taxi, rideshare and a booked car, with the fares and times published.
O'Hare parking by terminalPremier is under 300 feet from Terminals 1 and 3 at $63 a day. Economy lots need a train ride in.
Flight canceled at O'HareRebook with your airline. American, Air Canada and United desks past security, and hotel shuttles.
Missed connection at O'HareNo published rebooking rules. Airline desks, Travelers Aid, the Hilton inside and other terminals.
Every maintained entry from the airport's official map, grouped by what you need. Check the terminal and security side before making a detour.
Concourses B and C. The Airport Transit System stops at Terminal 1, and on the secure side Terminal 1 has pedestrian connections to Terminal 2 and Terminal 3. The Terminal Transfer Bus to Terminal 5 leaves from Gate C18B.
Concourses E and F. The Airport Transit System stops at Terminal 2, and on the secure side Terminal 2 has pedestrian connections to Terminal 1 and Terminal 3.
Concourses G, H, K and L. The Airport Transit System stops at Terminal 3, and on the secure side Terminal 3 has pedestrian connections to Terminal 1 and Terminal 2. The Terminal Transfer Bus to Terminal 5 leaves from Gates G17 and K20.
Concourse M, and the arrival point for international flights that clear U.S. Customs and Border Protection at O'Hare. Terminal 5 has no pedestrian connection to the other terminals on the secure side: take the Airport Transit System, or, with a same-day boarding pass, the Terminal Transfer Bus from Gate M13, 11:30 a.m. to 9:30 p.m.