The new Electronic Travel Authorization, or Canada eTA, is a quick and easy solution to obtaining a Canada visa and needs to be in your possession prior to boarding the aircraft, otherwise you may not be permitted to board. However, should you be entering the country by air or sea, the normal visa regulations would apply.
 

Application for an Electronic Travel Authorization (eTA)

Before you submit your application, review it carefully. Make sure it is complete and accurate.
Entering incorrect information could lead to a delay or even a refusal of your eTA application and/or prevent you from boarding your flight.
Important:
Please recheck all information entered before submitting your application form.
After payment no changes can be made as your application would already be under process.