He also said building a Boris Island hub airport would be "stupid, hare-brained".
He also said he thought the idea of a Boris Island airport in the Thames Estuary was "a bit mad".
The Mayor of London's plans to build an airport in the Thames Estuary, dubbed 'Boris Island', have often been described as 'pie in the sky'.
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And the talk of an airport on Boris Island - in truth an idea which long predates the current Mayor of London - will now begin in earnest.
But Mr Johnson did not steer clear and he said that a new hub airport in the Thames Estuary - dubbed Boris Island - was the only real solution.
Meanwhile, the London mayor earlier took his case for a "Boris Island" airport in the Thames Estuary to Sir Howard Davies, who is charged with reviewing government aviation capacity policy.
Among the options most favoured by the industry are a third runway at Heathrow, a new runway at Stansted or the so called Boris Island hub airport off the Essex coast.
The three proposals on the shortlist include building the four runway airport beside the Thames estuary, building in the so-called "Boris Island" in the middle of the Thames or development at an enlarged Stansted.
Mr Johnson has opposed the expansion of Heathrow Airport but has said "further runway capacity" is vital and regards "Boris Island airport" - as the Thames estuary plan has become known - as a viable solution.
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There have also been three different plans to build airports in the Thames estuary - a floating airport designed by architects Gensier, another plan known as Boris Island after it was backed by London mayor Boris Johnson, and proposals for a hub airport on the Isle of Grain designed by architect Norman Foster.
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