Heathrow is 14 mi ( 23 km ) west of central London , near the south end of the London Borough of Hillingdon on a parcel of land that is designated part of the Metropolitan Green Belt .
Heathrow is in the London Borough of Hillingdon , 15 miles ( 24 km ) west of Central London , England , Heathrow has two parallel main runways running east-west and five terminals .