Manchester Airport has been ranked the worst in the UK with average flight delays of nearly 20 minutes.
Departures from the country's third busiest airport were 19 minutes and 30 seconds behind schedule in 2025, according to Civil Aviation Authority (CAA) data studied by the Press Association.
Birmingham Airport had the second poorest flight punctuality last year, with an average delay of 18 minutes and 42 seconds.
Bournemouth Airport was third with 17 minutes and 18 seconds, while Liverpool John Lennon Airport had the most punctual flights with an average delay of nine minutes and 24 seconds.
Flight delays are often caused by issues outside the control of airports, such as air traffic control (ATC) disruption and bad weather.
Rory Boland, editor of magazine Which? Travel, said the choice of airport "shouldn't make or break your trip" but "too many holidays got off to a terrible start last year".
He added: "Manchester Airport has ranked last in our airport survey for four consecutive years and these new CAA figures validate why this is a particularly poor place to be stranded during delays.
"For passengers already wary of travel uncertainty, seeing such consistent underperformance makes it difficult to book with any real confidence."
The analysis took into account scheduled and chartered departures from the 23 commercial UK airports with at least 1,000 outbound flights last year.
Cancellations were not included.
Manchester is the UK's only two-runway airport other than Heathrow, and was used by 32 million passengers last year.
A spokesperson for the airport said: "Punctuality is affected by factors that are outside of an airport's control.
"The two most significant factors contributing to delays in the last year have been industrial action affecting air traffic control in Europe, and the weather.
"These were exacerbated by airspace restrictions above conflict zones meaning airports with significant long-haul networks, like Manchester, were more significantly affected than others."
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