I believe you just pay the difference. - nappingbeauty  269.4 #830 1:17PM

yes, you have to pay the full difference in price between the 2 passes, not prorated - TickledTink  352.8 #406 1:24PM

Depending on which pass he has, he just has to pay the difference. We did that with my familys' passes. They had Deluxe and paid the $130 difference on each pass to upgrade to premium. As TickledTink said^^, yes, it's not prorated so he still would have to pay the full difference. - OCdrumGuy  549.0 #203 1:25PM

Thanks - Bambi.  595.2 #184 1:32PM

I don't know if he Paid the extra $99 for parking on his deluxe pass....but premium comes with parking so they will refund you the $99 back to put towards the difference....it only cost me $21 to upgrade to premium. - bagglady  342.9 #426 5:50PM

Check your expiration date. You don't get additional time when you upgrade. It might be cheaper to wait and just buy single days if you only go a couple times. - GusGus  776.2 #124 5:52PM