Wizz Air is reported to have the worst punctuality record of the busiest airlines operating from UK airports.
The Hungarian low-cost carrier’s UK departures were an average of 23 minutes late in 2017, according to Press Association analysis of Civil Aviation Authority data.
Norwegian had the second worst performance, followed by Vueling and Thomas Cook Airlines.
The ranking features 44 airlines with at least 2,000 scheduled flights from UK airports last year.
Average delay figures take into account every flight that operated, including those that were on time. Cancelled services are excluded from the CAA data.
SAS was the most punctual, with aircraft typically taking off just seven minutes behind schedule.
Aer Lingus had the second best record, followed by Air France, Alitalia and Delta Air Lines.
The average delay across all flights was 15 minutes.
A Wizz Air spokeswoman said: “A number of issues specific to the UK, including airport infrastructure, airspace congestion and slot restrictions contribute to a significantly worse on-time performance of our UK routes compared to the rest of our network.”
Disruption was caused by “particularly severe winter weather” last year. The airline is taking measures to improve its punctuality, such as basing eight aircraft in the UK to reduce its exposure to inbound delays.
Norwegian Air Shuttle’s UK flights mainly consist of short-haul services from Gatwick, Manchester and Edinburgh. Its average delay of 22 minutes did not take into account the majority of Norwegian’s long-haul flights from UK airports, which are operated by a British subsidiary.
A Norwegian spokesman said frequent air traffic control strikes across Europe and adverse weather “invariably impact punctuality” and are beyond the control of airlines.
He added: “We do everything possible to ensure that flights operate to allow passengers to reach their destination as soon as possible.
“Norwegian is committed to keep improving punctuality, and where factors are within our direct control we have introduced new measures to continue delivering a smooth, efficient experience for our passengers.”
The CAA said punctuality “clearly matters to airline passengers” and it publishes the performance of carriers to allow people to “make informed choices about which airline to fly with”.
Dale Keller, chief executive of airline association BAR UK, said delays are “extremely costly” to carriers.
He added that airlines are “fully engaged” with governments, ATC providers and airports to minimise the causes of disruption which are outside their own control.