Spokane International Airport Parking is abundant. They have several outdoor parking lots as well as two parking garages. There is long term parking both secured and non secured outside lots but you can also park for extended periods of time in one of the covered garages. The garages are a little more spendy than the outdoor lots but well worth it to me and it makes it so we don't have to carry our luggage as far. In the one outdoor lot that is farthest away they do have a shuttle to and from the terminal.
Daily and hourly rates. Plus a few metered parking spots out front for quick visits, like picking up guests that are flying in.