About 83.9 million passengers travelled through Heathrow’s terminals in 2024, the airport has said.
This record-breaking number is 4.7 million more than in 2023 and 3 million more than the previous annual record in 2019, before the pandemic.
Heathrow forecasts it will serve 84.2 million passengers this year.
It added it would be investing over £1bn this year to make the airport fit for the future.
Heathrow chief executive Thomas Woldbye said: “I’m proud of all my colleagues and our partners who worked so hard to deliver great experiences for more passengers than ever before.
“In 2025, our journey towards better value for our customers will continue by investing in the kind of facilities our passengers and airlines are looking for.”
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