Close to a third of all flights in spring this year were delayed, the latest figures reveal.
The Civil Aviation Authority figures for ten major UK airports show delays were far worse than those during the same period – April to June – last year.
The worst airport was London City, where only 65% of scheduled flights were punctual.
Only Stansted and Luton showed any improvement, for scheduled flights, compared with last year’s figures.
Charter flight punctuality at Manchester airport dropped almost 10%, and the average delay across all ten airports was 25 minutes.
Only Gatwick and Glasgow saw an improvement in their charter flight punctuality, while it got worse in the other airports.
The best performing airport overall was Leeds Bradford, with an average delay of five minutes.
Bob Tolliday, Which? travel spokesman, said: ‘These figures are really dreadful. There were no unusual external problems for flights this spring.’