I just booked an Air Canada flight from Toronto to Portland via Calgary. My layover in Calgary is 2 hours. I wonder if I'll be going through Customs and Border security in Toronto or in Calgary? It can be a very time consuming process and I don't know if I'll have enough time if this will happen in Calgary.
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You will be going Customs and Border security in the first place in the country or in the last when you are leaving. – Marcel P. May 19 '17 at 15:40
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If you're worried that pre-clearance in Calgary will be as time-consuming as it normally is in Toronto, don't be: in my experience, every US pre-clearance facility in Canada takes less time than the one at Toronto Pearson. I regularly fly out of Winnipeg (admittedly a smaller airport than Calgary) and it never takes more than about 15–20 minutes from the time that I get in line. – Michael Seifert May 19 '17 at 18:58
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US preclearance always happens at the last airport before you enter the US. So you'll do it in Calgary.
