Heathrow set new record passenger and cargo figures in October.
More than 6.5 million passengers used the airport - 2.8% up on last year - and the 12th consecutive record breaking month.
Heathrow said the Middle East experienced the highest growth (up 11.8%), as larger, fuller aircraft boosted passenger numbers for the region.
And additional FlyBe services led to an uptick in domestic travel (up 2%), with the regional airline transporting an extra 20,000 passengers.
October was cargo's busiest month in history and the first time that over 150,000 metric tonnes of cargo travelled through the UK's largest port.
Heathrow's cargo volume levels reached record levels, for the 15th month in a row, up 9.2% compared to the same time last year.
Chief executive John Holland-Kaye said: 'Record passenger and cargo figures underline Heathrow's position as a critical national asset.
'We remain on track to expand Heathrow in a way that is affordable, financeable and which meets all our environmental obligations, securing Britain's place as one of the world's great trading nations in the early years of Brexit.'