After the war, Lewis was hired by the Vickers company to teach Chinese pilots to fly and to establish a Peking–Shanghai air service using Vickers Commercials, the civilian version of the Vickers Vimy bomber. In Peking in 1921 Lewis married Evdekia Dmitrievna Horvath, known as Doushka (1902–2005), the daughter of a Russian general. He returned to England when the air service project was abandoned by Vickers after a couple of years. With his first wife, he had one son and one daughter.