Generally, you either need a visitor visa OR an Electronic Travel Authorization (eTA) to fly to a Canadian airport. You only need one or the other, not both.

There is an exception for those travelling with a valid U.S. passport: you do not need a Canadian passport, a Canadian visa or an eTA to enter Canada.

If you require a Visitor Visa to enter Canada, please note the current processing times (updated as of Dec 17), based on location of application:

UK: 402 days

US: 27 days

Australia: 14 days

Check the latest processing times here: www.canada.ca/en/immigration-refugees-citizenship/services/application/check-processing-times.html

Apply for a Visitor Visa: https://www.canada.ca/en/immigration-refugees-citizenship/services/visit-canada/apply-visitor-visa.html

If you require an Electronic travel authorization (eTA) to enter Canada, note that most applicants get their eTA approval (via email) within minutes. However, some requests can take several days to process if you’re asked to submit supporting documents.

eTA eligibility requirements/application process:

https://www.canada.ca/en/immigration-refugees-citizenship/services/visit-canada/eta/facts.html