It means a daily limit on departing passengers will now apply until after the October half-term holidays.
The airport also said the cap would be kept under regular review and could be lifted early if staffing levels improved.
In response, a spokesman for airline Virgin Atlantic said: "We are disappointed that Heathrow Airport has already decided to extend the passenger capacity cap until the end of October, as additional resources come on line every week and the airport experience improves." Consumer rights group Which? also warned the move will leave thousands of passengers' plans in limbo, saying the situation was a "mess".
According to aviation analytics firm Cirium, the number of last-minute flight cancellations from the UK was up 188% in June 2022, compared to June 2019 before the pandemic.
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