The following change fees apply to same-day alterations, per Air Canada's Same Day Flight Change Policy:
Economy Basic Fares Not allowed
$150 for standard fares
USD 100 (between Toronto and LaGuardia, JFK, or Newark) (between Toronto and LaGuardia, JFK, or Newark)
75 USD for Flex and Comfort Fares
USD 0 (between Toronto and LaGuardia, JFK, or Newark)
USD 0 for Latitude, Premium Economy, Business
If Flexible only
Dollars One Hundred for all Award Tickets
USD $75 for members of Aeroplan Diamond
Altitude Super Elite 100k members pay nothing.
Read also : United Same Day Flight Change | Aeromexico Same Day Flight Change