Is ONE PIECE episode 449 filler?
Canon No, episode 449 of ONE PIECE is canon.
#449
Magellan's Tricky Move! A Foiled Escape Plan!
マゼランの奇策！はばまれた脱獄計画
Aired 2 May 2010
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.