Immigration, Refugees and Citizenship Canada (IRCC) reminds that of March 15, 2016, visa-exempt foreign nationals have needed an Electronic Travel Authorization (eTA) to fly to Canada. The leniency period that has allowed travellers to board their flight without an eTA over the summer ends on September 29, 2016.
If you received your study or work permit on or before July 31, 2015, you will need to apply for an eTA if you wish to enter or return to Canada by air.
If you received your study or work permit on or after August 1, 2015, you were automatically issued an eTA with your study or work permit. No further action is required; however, please ensure that you travel to Canada using the same passport you used to apply for your study or work permit.
Please visit the IRCC website if you need more information.