The plane carrying President Kenyatta and the First Lady touched down at the Jomo Kenyatta International Airport shortly after 6am.
They were received at the airport by Deputy President William Ruto, Chief of Defence Forces Julius Karangi and other senior government officials including Interior Cabinet Secretary Joseph ole Lenku.
Thereafter, the President inspected a guard of honour mounted by a detachment of the Kenya Air Force before he was entertained by choirs and groups of cultural dancers.
In her debut at the marathon, the First Lady covered the 42 kilometres London Marathon in 7 hours and 4 minutes and President Kenyatta was at hand to receive her when she touched the finish line.
The First Lady participated in the marathon to raise awareness and funds for her ‘Beyond Zero Campaign’ which she launched on 24 January this year.
The initiative is aimed at improving maternal and child health care in Kenya as well as accelerating implementation of the national plan towards the elimination of new HIV infections from mothers to children.
Before travelling to London to support the First Lady in her historic participation at the London Marathon, President Kenyatta was in Turkey for a State visit.
Earlier, the President had attended the 20th anniversary of the Rwanda genocide in Kigali.