Wizz Air has the worst punctuality record of the busiest airlines operating from UK airports, an investigation has found.
The Hungarian carrier's UK departures were an average of 23 minutes late in 2017, according to Press Association analysis of Civil Aviation Authority (CAA) data.
Norwegian Air Shuttle has the second worst performance, followed by Vueling Airlines, Thomas Cook Airlines and BMI Regional.
The ranking features the 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.
Scandinavian Airlines is the most punctual, with aircraft typically taking off just seven minutes behind schedule.
Aer Lingus has the second best record, followed by Air France, Alitalia and Delta Airlines.
Average delay 15 minutes
The average delay across all flights was 15 minutes.
A spokeswoman for Wizz Air 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."
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".
Passengers on delayed flights from UK airports are entitled to assistance and compensation depending on the cause and length of the disruption.
When flights are delayed for more than two hours, airlines have to provide free access to phone calls or emails, meals and refreshments, as well as hotel accommodation if an overnight stay is required.
Passengers can also claim compensation when flights are delayed by more than three hours unless there are "extraordinary circumstances" such as severe weather or a security alert.