A record 6.6 million passengers travelled through Heathrow last month, making it the busiest June on record.
The airport handled around 40,000 flights last month as passenger traffic rose 1.1 per cent compared to the same period in 2014.
Heathrow said passenger volumes to emerging markets were particularly strong, with Mexico up 23.6 per cent, China up 15.2 per cent and Turkey up 3.4 per cent compared with June last year.
The figures follow a successful period for Heathrow after the Airports Commission recommended it for expansion with a new third runway.
Heathrow CEO John Holland-Kaye said: “On the first of July, the Airports Commission ended the debate on where a new runway should be built by unanimously recommending Heathrow’s new expansion plan.
“It’s now a binary choice for the British Government. We either expand Heathrow – creating jobs, growth, a rebalanced economy and lucrative export routes – or we do nothing and retreat as a nation. The answer is obvious, so let’s get on with it.”