If you are a US citizen, you must carry proof of citizenship such as a: passport. birth certificate. certificate of citizenship or naturalization.
This is the Government of Canada's official web page to apply for an electronic travel authorization (eTA) to fly to, or transit through, a Canadian airport. It only costs CAN$7.
Entry into Canada: Canadian law requires that all persons entering Canada carry proof of citizenship and identity. A valid U.S. passport, passport card, or NEXUS card satisfies these requirements for U.S. citizens. Children under 16 only need proof of U.S. citizenship.
U.S. citizens and permanent residents entering Canada by land are required to possess the requisite documentation, such as a passport, driver's license, and other valid identification documents. They must also meet other criteria, such as passing security measures, before they are allowed entry into Canada.
When you travel to Canada make sure you have: your letter of introduction. valid passport or travel document. if you're visa-required, it must contain the visa sticker that we put in it. if you need an eTA and you're flying to a Canadian airport, it must be the passport that's electronically link to your eTA.
Travellers who are exempt from the eTA requirement. U.S. citizens are exempt from the eTA requirement and must carry proper identification such as a valid U.S. passport. Lawful permanent residents of the United States who hold valid status in the U.S. are exempt from the eTA requirement.
An Electronic Travel Authorization (eTA) is an entry requirement for visa-exempt foreign nationals travelling to Canada by air. An eTA is electronically linked to a traveller's passport. It is valid for up to five years or until the passport expires, whichever comes first.