Flights to and from the UK faced delays earlier as the UK’s Air Traffic Control (ATC) systems experienced a “technical issue”.
Airlines warned passengers of delays until the problem is resolved.
In a statement, UK Airpsace provider NATs said: “Engineers are working to find and the fix the fault. We apologise for any inconvenience this may cause.”
They later confirmed the issue had been resolved but flights are still delayed due to the knock-on effect of the fault.
According to data from aviation analytics firm Cirium, 232 fights that were due to depart UK airports have been cancelled along with 271 inbound flights.
The travel chaos came on the UK’s busiest weekend as people travelled for the late summer bank holiday weekend.
Cirium data shows 3,049 flights were due to leave UK airports today.
Many flights are still facing delays of over 8 hours.