She was born in 1976 to Kenyan parents. Her father was an airline pilot with Kenya Airways. He has since retired and is an aviation consultant. Koki attends Moi Girls School Nairobi. After high school in 1992, at the age of 17, she enrolled in the Nairobi flight school at Wilson Airport, where she obtained her private pilot license. She continued her pilot training in Oklahoma City in the United States, where she obtained the commercial airplane pilot license, issued by the Federal Aviation administration.
She returned to Kenya in 1995, and was hired by Kenya Airways, where she remained the only female pilot for six years. In 2004, she became the first African woman to be certified to fly a commercial aircraft, when she was certified to be the pilot-in-command of a Boeing 7374. She was later certified to fly the Boeing 767.
She then followed the adaptation training which enabled her to make the transition to commander of a Boeing 787 Dreamliner. Kenya Airways has since promoted her to Commander of the B787, making her the first African woman to take on this role in the world.
His motivation to become a pilot was formed during his childhood, observing his father, at the time pilot for Kenya Airways. Commander Mutungi, who has a son, born around 2006, likes to fly and sponsor other people, especially female pilots. In September 2014, Mutungi was one of the 39 female pilots of Kenya Airways, out of a total of 530, and she was captain on the Nairobi-Paris route carried out in B7878. She is thinking of creating her own airline, where half of the pilots would be women.