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.
Most Canadian citizens are exempt from this requirement. However, it will apply to Canadian citizens who: need a visa or a waiver of ineligibility. must obtain an I-94 Arrival/Departure Record form to document dates of entry and exit from the country.
Travellers who cannot apply for an eTA and need to carry other identification: Canadian citizens, including dual citizens, need a valid Canadian passport.
To enter or transit through Canada, most people need a visa or an Electronic Travel Authorization ( eTA ) – not both. Check if you need a visa or an eTA online. You do not need a visa for short visits (normally up to 6 months). You may need an eTA instead.
Do I need an ESTA? You'll need one if: You're a UK citizen or a citizen from another visa waiver country visiting the US. Your trip is for 90 days or less and is for business or pleasure.
CBP encourages travelers to apply for a travel authorization at least 72 hours in advance of their anticipated arrival at a U.S. land port of entry. I am a citizen of Canada? No, citizens of Canada who are traveling with a Canadian passport do not need an ESTA.
Who already have a visa in their passport. Travelers may wish to avoid buying plane tickets until they have obtained an ESTA (or a valid visa, in case the ESTA is not approved). ESTA applications may be submitted at any time prior to travel. The processing of an ESTA can take up to 72 hours.
If you don't have one, you won't be able to board your flight.
In addition to your passport, you may need a travel authorization such as a visa or an Electronic Travel Authorization (eTA) to enter Canada. Consult Immigration, Refugees and Citizenship Canada's website to learn which authorization you need: Find out if you need a visa to travel to Canada.
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.