King Arthur : Legend of the Sword released before May 15 , 2017 , in the US and after May 15th , 2017 in the United Kingdom .
King Arthur premiered at the TCL Chinese Theatre on May 8 , 2017 and was theatrically released in 2D and RealD 3D on May 12 , 2017 in the United States and May 19 , 2017 in the United Kingdom .