The 10 people who made the most complaints last year accounted for 48,562 complaints, while 2,775 individuals filed a complaint over 2017.
Some 1,566 complainants contacted Heathrow once, while 10 people complained over 1,280 times last year.
Over 20,000 complaints came from 36 people in Slough last year.
More on CITY A.M.
Watch London Heathrow live.