Release Date - October 6, 2023

[ScorseseFan]

KILLERS OF THE FLOWER MOON will open in limited release on October 6, 2023. 
Then go wide on October 20th.  

variety.com/2023/film/news/killers-of-the-flower-moon-release-date-martin-scorsese-leonardo-dicaprio-1235565330/

(And if I was to take a wild guess, I imagine the film would then release on AppleTV+ over the Christmas holidays.) 

[Zotyto]

And a Cannes premiere (probably).

[Leo_The_Last]

Opens the door to play in Competition...

Paramount Sets French Theatrical Release For ‘Killers Of The Flower Moon’; Move Ties Film Into 17-Month, Cinema-To-Streamer Window

Confirmation of the French theatrical release opens the door for Killers Of The Flower Moon to play in Competition, if indeed, the film has been made available to Cannes, and the festival and Scorsese want to go down that route.

Under Cannes rules, which are in step with the French windowing laws, only films guaranteed a theatrical release in France can compete for the festival’s coveted Palme d’Or, a stipulation that has kept Netflix and its top titles away from the Croisette in recent years.
deadline.com/2023/03/paramount-france-theatrical-release-for-killers-of-the-flower-moon-apple-windows-1235311485/