Heathrow asked airlines to remove 30 flights from schedules on Thursday morning. It said it was expecting more passengers than it could currently cope with.
Over 1,000 flights were scheduled to leave on Thursday as British tourists try to get away for a holiday.
The airport said the cancellations were necessary for safety reasons and to ensure as many passengers as possible get away.
It said that individual airlines would contact all affected passengers on Thursday.
British Airways said a…