Press Association analysis of Civil Aviation Authority (CAA) data reveals that Luton and Gatwick were among the worst UK airports for flight delays in 2017, while Heathrow is one of the best.
Flights from Luton departed on average 19.7 minutes late – nearly a minute later than Gatwick airport, which had the second-highest delays at 18.9 minutes. Jersey, Durham Tees Valley and Birmingham also come in above the 18-minute mark.
Heathrow presented the lowest delays at 11 minutes, followed by Leeds Bradford and Belfast City at 11.3 minutes and London City at 11.6 minutes.
The analysis only took into account scheduled and chartered services, not those that were cancelled altogether.
According to the Press Association, flights across the UK left on average 15 minutes late.
Gatwick has said that it is taking steps to improve its on-time performance, while Luton airport blamed delays on factors outside its control, according to the BBC.
Luton was under threat of strikes this summer, but workers have since suspended industrial action.