Parking at YUL airport or the nearby Econo-Park is quite expensive, from $25-30 CAD per day, which makes it not practical even for trips over 2 days, even by just an hour, since you get charged a full extra day. It used to be able to park in a lot nearby for $15/day and get a free return airport shuttle, but I could not find that parking anymore.
What is the cheapest parking option near Montreal airport including transport to and from the terminal?