The body was discovered just before Flight 950 was about to land, The Atlanta Journal-Constitution reported.
"Upon final approach into Atlanta, our in-flight crew was advised that a passenger passed away in the on-board restroom," Delta spokeswoman Keyra Lynn-Johnson said. "Medical professionals and authorities met the flight."
Johnson said she had had no information on the passenger.
Interpol investigating stolen passports on missing flight
Senate Democrats to pull all-nighter on climate change