Before going along with the air canada seats selection, keep these points in mind.
According to the policy of the airline, passengers can select their desired seat at the time of check-in for free.
In case you want to select your seat before check-in at the time of booking or in between the booking & check-in you will have to pay an additional fee for the same.
The charges for Air Canada Seat Selection for a basic fare vary between $20-$100. In the case of standard fare tickets, the fare falls between $20 to $50.