The budget flier’s aircraft departed an average of 23 minutes late last year.
Norwegian Air Shuttle was next worst, then Vueling, Thomas Cook Airlines and BMI Regional, analysis of Civil Aviation Authority figures reveals.
Scandinavian Airlines was most punctual, with take-offs typically seven minutes late. Average delay for the 44 airlines with at least 2,000 scheduled flights from the UK’s airports was 15 minutes.
Wizz Air said issues specific to Britain, including airspace congestion and slot restrictions triggered delays.
Severe winter weather also caused disruptions.
The Hungarian company said it was basing eight aircraft in Britain to help reduce in-bound delays in the future.
Delayed passengers in the UK can get compensation depending on cause and wait length.
The North Yorks couple were due to fly from Doncaster Sheffield Airport to Wroclaw in Poland at 10.15pm on Friday.
A fault with the plane’s engine meant they only took off at 9am yesterday.
They spent one night in a hotel and a second sleeping at the airport.
Louis said: “There were children sleeping on suitcases. It was a big mess.”
Joanna said: “We’ve been treated like cattle.”