Hi there and welcome to planDisney!
Magic Kingdom Park at Walt Disney World is my favorite of the four theme parks. I have been visiting since I was a little girl and love taking my own kids to make new memories with them.
Currently,
theme park reservations are required when visiting the parks, so if a park is not showing availability online, the same will be true if you tried to purchase tickets in person. This Sunday is New Year's Eve, which is one of the busiest days of the year at Magic Kingdom, if not
the busiest day of the year with Guests from all over the world wanting to celebrate and ring in the New Year with Mickey Mouse and friends. It's possible that availability will show up if other Guests change or cancel their plans, so you'll have to keep checking the
theme park availability calendar frequently.
As an alternative, you can purchase a park ticket for another park and, if parking hopping is available, park hop to Magic Kingdom Park after 2:00 PM. Please note that since this is a very busy day around Walt Disney World, park hopping will only be available if Magic Kingdom is not at capacity, and you won't know that until the day of. You can check this on the
My Disney Experience mobile app under "Park Hours" on the home page.
I wish I had a better answer for you, but I know whatever you choose to do at Walt Disney World for the New Year will be full of fun. Please stop back by and visit if you have any additional vacation planning questions.
Have a magical day!
Leslie