The airline will fly five times a week from Terminal 5 to the Saudi Arabian cities of Jeddah and Riyadh, with tickets having gone on sale on Wednesday (November 26th).
Commenting on the return of the routes, a statement on the BA website said: "We are able to restart flights because the aviation market between the UK and the Kingdom of Saudi Arabia has recently been liberalised."
BA suspended flights between Heathrow and Saudi Arabia in March 2005 due to commercial performance.
The airline will operate Boeing 777 aircraft to and from Riyadh, while a Boeing 767 will be used to and from Jeddah.
Bmi recently announced that it would double the number of flights to the Saudi Arabian capital Riyadh from January 15th next year, increasing their number of services to the city from three a week to six.