Hey there John,
Welcome to planDisney and thank you for your question! It sounds like you're planning a trip to the Disneyland Resort in sunny California - how exciting!
The details for canceling your trip to the Happiest Place on Earth depend on a few different factors like who you booked your trip through, what components were included in your package, etc. Ultimately, your best bet will be to call directly from wherever you booked your package so they can see all the specifics of your trip and give you a detailed answer.
However, in general,
theme park tickets are nonrefundable. Once you've purchased your tickets then they're good to be used on valid dates through their expiration, which is often a year or more from the purchase date. To visit the parks of the Disneyland Resort, you need to also make
theme park reservations, but those can be modified at just about any time.
If you purchased a vacation package from the Walt Disney Travel Company, it might also be helpful to check the
Vacation Package Terms & Conditions to get the most up-to-date information - specifically the Cancellations and Refunds section. However, if you instead booked through a local travel agency then I would work with them directly for more specific information for your situation.
Thank you again for your question, John! I hope you enjoy your next visit to the Happiest Place on Earth.
Have a Magical Day,
Greg