Do I have to go through security again for connecting international flight at SFO?

Please note connecting passengers exit into the airport's public area and are required to clear security prior to boarding their next flight.



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When you're connecting from an international flight to a domestic one, you'll always have to exit and reenter security as you'll need to go through customs and immigration (unless you have gone through preclearance aboard, which is rare).

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You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight. Finally, you'll need to go through Transportation Security Administration screening. This may include a physical inspection of your luggage and personal items with a metal detector or a full-body scan.

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What is a good connection time? 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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To put it simply, having a connecting flight means you will have to change planes. You will not be flying directly from A to B, but there will also be C. You will fly from A to C, and then from C to B. Sometimes there will be more than a single stop.

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You might have to go through customs during a layover, especially if your layover is in the Schengen Area (which consists of most countries in the EU). For example, if your final destination is Paris, France, but you have a layover in Madrid, Spain, you will actually go through customs in Spain, not France.

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Two to three hours is the minimum recommended time for an international layover, but more might be needed. Sally French is a travel rewards expert who joined NerdWallet in 2020.

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If you're flying internationally, you may need to go through a second security screening before your flight: immigration. All you'll need to do here is show your passport and follow the instructions from the immigration staff. This is the last step before you can walk to your gate for your flight.

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If you missed your connecting flight due to a short layover, the airline will book you on the next flight free of charge as long as the connecting flight is part of the same ticket.

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International Connections
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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When checking in your luggage in most cases it will be checked through to your last stop. When arriving at the connecting airport all you have to do is to go to your next gate and wait for the next plane, your next flight. There might be a security check in the terminal at the connecting airport.

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If you're flying on separate tickets, yes you will have to collect your bags and re-check in. However, if you're flying on a single ticket your bags will be transferred directly to your connecting flight even if you're flying a different airline.

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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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So how do you know how much time to leave for connecting flights when you have booked with two separate airlines? The rule of thumb is that you leave AT LEAST 3 hours from arrival to departure for international flights and 1.5 hours for domestic.

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