The airport initially introduced the cap on daily departing passenger numbers in June, which it said has since "slightly reduced" numbers, bringing them into line with available resources.
"There has already been an improvement in punctuality, shorter waits for bags to be delivered to reclaim halls and fewer cancelled flights," a spokesperson said.
"Heathrow is keen to get back to operating without a cap as quickly as possible, but that is dependent on teams across the airport, notably some airline ground handlers, achieving sufficient resource levels."
