Cancelation or cancellation? Don't get "canceled" for spelling wrong.

creation-date:: 2023-07-24

cancelation | cancellation
While rules favor the spelling with a single L if it appears in an unstressed syllable (e.g. cancel), "cancellation" with double Ls is an exception and the dominant spelling in the United States. I spell it this way too.

But, as a verb, the usual rule reigns, so for US English 'canceled' is way more common than 'cancelled,' as explained by M-W.