The figures – which are provisional for the whole of 2010 - compare to an overall leisure and business travel slump of 0.4% in UK travel.
Overall leisure and business visits to London increased by nearly 3%.
The figures were affected by travel disruption caused by volcanic ash, strikes and severe weather conditions.
London & Partners interim chief executive Danny Lopez said: "These figures show that London continues to be a popular destination for both leisure and business visitors. It is very positive news for the capital that we are not only attracting new markets but continuing to see growth from some of our traditional markets.
The Mayor of London Boris Johnson said: "London has always been a magnet for visitors from all four corners of the globe and these new figures show that our attraction is stronger than ever. As we look towards the 2012 Games and beyond our offering is only going to get better. We must do all we can to stay at the top of our game."
This January, it was announced that London would buck UK’s trend and return to pre-recession levels.