A game-high haul of 29 points from Brooklyn Nets superstar Durant saw the United States to a victory that avenged their opening group-stage loss to France.
It meant the USA kept up their strong recent record on the Olympic stage, with Durant securing a third gold medal of his career.
Jayson Tatum weighed in with 19 points, while France had five players in double figures but nobody in their ranks scored more than the 16 points managed by both Rudy Gobert and Evan Fournier.
The USA led by 11 points at 71-57 in the third quarter, but an impressive France cut that advantage to three points at 73-70 with 5:42 remaining of the fourth after Frank Ntilikina drained a three-pointer
France again reined in a double-digit lead to get back to 85-82 in arrears with 10 seconds remaining, but a foul by Gobert on Durant gave the USA's star man the chance to put the game away, which he seized by making both his free throws.