Submit your customs and immigration declaration online using Advance Declaration up to 72 hours before you arrive in Canada. Among those exempted from this new requirement are U.S. citizens and travellers with a valid visa.A consent letter demonstrates that a child has permission to travel outside Canada from every parent or guardian who is not accompanying them on the trip. In addition to your passport, you may need a travel authorization such as a visa or an Electronic Travel Authorization (eTA) to enter Canada. The eTA can be obtained online through a short application form on the Government of Canada's website and electronically linked to your passport number. Passengers flying to Canada require an Electronic Travel Authorization (eTA). The application needs to be completed 72 hours prior to your departure date.