Is Bleach episode 286 filler?
Canon No, episode 286 of Bleach is canon.
#286
Ichigo's Return! Protect Karakura Town
一護の帰還！空座町を護れ
Aired 31 Aug 2010
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.