Do you have to go through customs from Zurich to London?
You'll have to go through immigration coming off an internal flight. Customs is just a walk through channel assuming you have nothing to declare.
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Thanks to the airport's compact size and the famous Swiss efficiency, the minimum connection time between flights is just 40 minutes. However, to avoid having to rush through the airport or stress about missing your flight in case of delays, choose an itinerary with a layover of at least one hour.
1 hour 50 minutes is ample time to go through passport control, take a short shuttle train ride from the central terminal to the E concourse and pass security in Zurich - IF your flight from Prague is not severely delayed.
You will land at Zurich airport and have to go to the remote terminal via an underground shuttle train. During this process, you will go through passport control where they will check your passport and put an exit stamp in it.
5. When do you go through customs on international flights? Usually, you go through customs when you exit the airport at your final destination. However, if you have a layover in a different city in your destination country, you may need to go through customs before your connecting flight.
Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
Duty-free regulations can be very strictly enforced. Visitors should be aware that there are now flying patrols of Frontier Guards who have the right to stop any car anywhere in Switzerland to see if there is undeclared merchanize in the car, and there are substantial penalities for undeclared items.
Changing flights at Zürich is easy and straightforward, with short routes between its three terminals. Terminals A and B/D are located under one roof and connected by the Airside Center shopping/dining complex. Passengers can walk between gates and there are also moving walkways.
Customs usually takes... 30 seconds or less. Assuming your United flight arrives on time, your problem will be boredom, not lack of time. 3 hours is more than enough time.
What happens if a flight is delayed and you miss your connection? If you miss your connection due to a delay, usually the airline is responsible for providing you with a replacement flight to your destination. They will have to book you on the earliest possible flight available.
Zurich and Munich are the only airports I would attempt a 1.5hr connection - you should be fine. 1.5 hours is tight, but should be doable. Immigration in Zurich is some of the best I've seen in terms of efficiency. I always buy some chocolate connecting via Zurich, they have some great stuff there.
At a minimum, I'd say you should plan for one hour for domestic layovers and two hours for international layovers. But this is not a hard, fast rule! If you have to go through security again on a domestic layover, you might need more time.