Howard made 5 of 6 from 3-point range in the first half, scoring 19 to lead the Dream to a 52-36 advantage.
A’ja Wilson scored eight of her 22 points to get Las Vegas (18-8) within 58-52 at the 5:55 mark of the third quarter. Hayes, AD Durr and Aari McDonald buried 3-pointers from there and Atlanta took a 70-56 lead into the final period.
Hayes opened the fourth with two 3-pointers and a three-point play to push the lead to 79-56, and the Dream cruised to the victory.
Jackie Young had 18 points and Kelsey Plum scored 17 for the Aces. Wilson added 10 rebounds for a double-double.