Are terminal 1 and 3 connected at O Hare?

Terminals 1-3, are connected and easily accessible from each other. If you… Access Terminals 1-3 upon arrival without having to clear the security checkpoints. If you have a connecting domestic flight via two different carriers, please contact your airlines.



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The fully automated free rail system transports passengers to and from Terminals 1, 2, 3 and 5, as well as the Multi-Modal Rental Car Facility (MMF), Rental Cars, Economy Parking F, Kiss 'n' Fly, Pace buses and Metro.

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The answer is YES, in theory. TSA is supposed to allow you access to the checkpoint of any terminal at an airport where you have a valid boarding pass for a departing flight on the same day.

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Do you have to go through security again for connecting flight? Yes, passengers usually have to re-clear security for connecting flights. It is recommended that travelers allow enough extra time before their connecting flight to pass through security and customs again.

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Terminal 1 / Concourse C
  • All Nippon Airways.
  • United Airlines.
  • United Express (ExpressJet)
  • United Express (GoJet Airlines)
  • United Express (Mesa Airlines)
  • United Express (Shuttle America)
  • United Express (SkyWest Airlines)
  • United Express (Trans States Airlines)


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Domestic Terminals 1, 2, and 3 are connected to each other and you can easily walk between them or take moving sidewalks and escalators. The walk from Terminal 1 to Terminal 2 takes about 10 minutes, and from Terminal 1 to Terminal 3 can take up to 20 minutes if you're walking from farthest gate to farthest gate.

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Generally, the first three terminals are considered domestic terminals and are easily traversed. All three of these terminals are connected by pedestrian walkways, making them so much easier to cross than having to wait for transportation to take you to them.

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If you're connecting on the same airline, in the same terminal, then yes, it should be enough time. Check first the airline's and flight's on-time record. If you need to change airlines, and terminals, it could be tight.

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Generally, the first three terminals are considered domestic terminals and are easily traversed. All three of these terminals are connected by pedestrian walkways, making them so much easier to cross than having to wait for transportation to take you to them.

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Realistically, the answer is NO. Also, flights board 30 minutes or so (depending on size of the airplane) so they would be in the final stages of boarding AT BEST when you get to the gate.

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The busiest times are 6-8 am, and 3-5 pm.

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Realistically, the answer is NO. Also, flights board 30 minutes or so (depending on size of the airplane) so they would be in the final stages of boarding AT BEST when you get to the gate. O'Hare arrivals at heavy traffic times are rarely exactly on-time.

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This is the O'Hare International Airport terminals map. Terminal 1, the ANA departure terminal, Terminal 2, Terminal 3, and Terminal 5, the ANA arrival terminal, are connected by the Airport Transit System (ATS), a shuttle service between terminals.

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Yes, there might be exceptions, but most often than not the airline won't wait. What you can do is to try to avoid missing your connection. But if you do miss your connection, don't worry, the airline will book you on a new flight for free (if it's an airline-protected connecting flight).

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The recommended layover time for domestic flights is normally one hour. However, as previously stated, you may require longer if your flights are booked with two different airlines, if you are traveling to a very busy airport or if you require special assistance.

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When layover flights are booked with the same airline, your baggage will be automatically transferred through to your final destination. However, if the two flights are with different airlines, you may have to claim and re-check your baggage during your layover.

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