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Do you need to go through security again for a connecting flight at O Hare?

If your connecting flight is in Terminals 1, 2 or 3, you can take the free, 24-hour Airport Transit System (ATS). All connecting passengers must go through Transportation Security Administration (TSA) security screening.



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All connecting passengers must go through Transportation Security Administration (TSA) security screening.

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For connecting domestic flights, you almost never have to exit and reenter security, though there are some exceptions at airports where the terminals aren't all connected. For domestic-to-international connection, it's still pretty rare that you have to exit and reenter security, even if you're changing terminals.

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The Airport Transit System (ATS) is a convenient, fast and reliable people mover system at O'Hare International Airport, offering fully-automated service every 3-5 minutes during peak hours, 24 hours a day, seven days a week.

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Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.

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Minimum connection times typically range between 30 minutes and two hours for domestic flights within the continental United States. For international flights, the range increases to between one and three hours.

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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 time between connecting flights can be pretty short – as little as 40 minutes for some airports. The airline is aware of your connection and will sometimes tell you which gate you need for your next flight. They might even offer assistance if you have a short connection time.

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If your itinerary was purchased as one ticket (as in: you have only one itinerary and one confirmation number), and the connection time was too short and you miss the second (or third) flight, you can rest easy, no matter what happens. The airline will simply put you onto the next available flight, free of charge.

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All connecting passengers must go through Transportation Security Administration (TSA) security screening.

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If a delay in your first flight is the reason you're missing your connection, don't worry too much. Usually, most airlines will rebook you on the next flight, and that too for free. Although, you might have to fly on standby depending on seat availability.

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Travel advisers say there's a lot to take into account when booking connecting flights, but a general rule of thumb is 60-90 minutes between domestic flights and at least two to three hours for international itineraries.

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

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According to a recent USAToday article, the average o'hare airport security wait times are around 15 minutes. The best Chicago ohare TSA wait times occur on Saturday 10-11pm. The worst Chicago TSA wait times are on Tuesday from 4-5pm, where you could wait up to 33 minutes.

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