A poll carried out by Opinium for the Evening Standard suggests Mr Khan enjoys a five point lead over Tory candidate Zac Goldsmith, with the support of 31 per cent of voters compared to his rival’s 26 per cent.
City Hall election rules require a second round of voting if no candidate receives more than 50% of the vote.
Today’s poll shows Khan is currently doing better at winning over the votes of other parties’ supporters, taking 55% of votes in a direct head-to-head contest between the pair.
Mr Khan’s lead mirrors the result of a poll carried out in January and comes despite weeks of questions about his ability to fund a four-year fares freeze.
Over the weekend the Labour candidate has also had to deal with a media storm caused by a former aide’s remarks on social media.
According to today’s poll, candidates from the smaller parties are trailing behind the frontrunners with UKIP’s Peter Whittle, the Green Party’s Sian Berry and Liberal Democrat hopeful Caroline Pidgeon all enjoying the support of respondents.
Those figures are significantly below each parties’ performance at the 2012 mayoral contest which saw the Greens take 4.5% of the vote and the Liberal Democrats 4.2%.
Opinium also puts Respect Party candidate George Galloway on less than one per cent.
Londoners will elect a new Mayor and the 25 members of the London Assembly on May 5th.
