2. The original 1-day non-hopper was bought in 2009 as part of a Free Dining Package from Disney. 4. If I understand correctly, I take the 2016 price of the 1-day ticket (anywhere from $103-$132 depending on season and park) and subtract from the 2018 4-day base ticket price. The difference is what I would pay to upgrade. Since the 2009 ticket didn't have a season or park specific option, is there a way to figure out the math? Thanks again!