When flying from Canada to USA when do you go through customs?

Written by Editorial Team | Last Updated: August 2026

Travelers flying from Canadian airports directly to the United States undergo U.S. Customs and Border Protection clearance before boarding their flight, thanks to specialized preclearance facilities located within major Canadian international terminals. Instead of clearing customs upon landing on American soil, passengers complete all passport control, immigration interviews, and agricultural inspections right at the departure airport in Canada. This allows flights to arrive in the United States as domestic flights, enabling travelers to exit the destination airport immediately upon landing without enduring further border delays.

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