So... is Kanon (2006) finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 16, 2007
Manga finished: March 31, 2011
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
Yuuichi Aizawa returns to a snowy town he hasn't visited since childhood, having lost all memories of his time there.
As he re-establishes connections and befriends several young women, pieces of his forgotten past slowly begin to resurface.
The anime focuses on Yuuichi's journey to rediscover these lost memories and the significance of the girls he meets along the way, all while navigating the mysteries surrounding his forgotten childhood.