BAA chief executive Colin Matthews said: "We are sorry for the flights that had to be cancelled as a result of the snow. The cost of any disruption to BAA's airports is significant and a strong financial incentive for us to continue to make Heathrow more resilient."
Edinburgh and Southampton airports were worst affected by the weather, with passenger figures dropping by 18.4% and 22% respectively.
Strikes and volcanic ash
BAA also reported dealing with 103.9 million passengers in 2010, down 2.8% on 2009 figures, with BA strikes and the Icelandic volcanic ash cloud cited as loss factors.
Matthews added: "There were many challenges in 2010, ranging from poor weather and security threats through to industrial action and the cloud of volcanic ash. But we have continued our £1 billion-a-year investment programme and are encouraged by Heathrow’s underlying positive performance during challenging economic times."