A new survey from the Civil Aviation Authority (CAA) revealed that UK airports have experienced a decrease in flights leaving on time between April and June.
Year-on-year, the total of flights leaving and arriving on time is down for the second quarter of 2014.
The regulator monitored ten airports and all experienced a reduction in flight punctuality.
CAA statistics relate to five London-based airports and five regional airports, comparing both the expected and actual arrival and departure times.
While 78 per cent of flights took off on time, punctuality fell in the second quarter in comparison to the same period in 2013.
Scheduled flights from the five London airports saw a decrease in leaving times, falling from 80 per cent to 77 per cent.
The five regional airports monitored, including Manchester, Edinburgh and Birmingham, also experienced a decline in flight punctuality.
On average, during the monitored time-scale, scheduled flights were delayed by up to 12 minutes. This is an increase of one minute when compared to the 2013 results.