Strike action by border control staff notwithstanding, Heathrow Airport claimed it did manage to keep immigration queues at normal levels.
Gatwick Airport also said there were no delays in regular Twitter updates throughout the day.
According to airports operator BAA the contingency plans put in place helped prevent delays. But, said Thursday was expected be busier than usual.
For dealing with the situation, extra customer services staff has been put on standby to support passengers.
"As a result of the whole airport community working together over the past few days, more immigration officers were on duty and fewer passengers arriving than would otherwise have been the case," said the BAA spokesman.
"This put us in a better place to avoid the serious delays and widespread disruption at Heathrow that had been previously forecasted."
BAA claimed hundreds of customer services staff were equipped with Blackberries and iPads to keep passengers up to date.
"Our teams will continue to work hard to mitigate disruption to passengers in the aftermath of the strike today."