EasyJet faces accusations of ruining holidays by overselling thousands of peak season flights, forcing family groups to fly separately.
Some passengers were even sent to airports across the country to board a different aircraft.
Figures from the complaints handling website Resolver showed that more customers complained about being bumped off easyJet flights than all the other airlines put together, The Times reported.
The budget carrier accounted for more than three quarters of complaints.
Former tennis player Annabel Croft was reported as having booked tickets with easyJet, but when her family arrived at the airport for their summer holiday to Portugal they were told that her daughter would not be able to board the aircraft as it was overbooked.
A spokesman for the airline said that it received the most complaints because it was the UK’s biggest airline.
He added that denied boarding caused by overbooking was extremely rare.
He told The Independent that 2.6 million easyJet passengers a year fail to show up for booked flights.
“A flight will only be overbooked after reviewing the no-show rate for the last three months. On average, across our flights we will only overbook by one or two passengers per flight.”