Jeremy Corbyn's party is now a massive 17 points ahead of the Conservatives among voters in the capital, gaining an additional nine points in last month alone.
The Conservatives’ share of the vote has dropped to just 33 per cent, two points lower than in 2015, while Labour holds 50 per cent of the vote in the cosmopolitan city.
Analysis of the YouGov poll suggests that, if the polls prove accurate, the Conservatives could lose four seats in London – two to Labour and two to the Liberal Democrats.
Former Conservative MP Zac Goldsmith, who lost his Richmond Park seat to the Lib Dems in a by-election last year, also looks set to miss out again, according to polling data.
Jeremy Corbyn's Labour party is surging ahead of the Conservatives in London polling
The findings are the third instalment in Polling London, a new research project from Queen Mary University of London.
Philip Cowley, professor of politics at Queen Mary and project leader, said if the polls do reflect true voter behaviour then some of the results in London would not have been in the "Conservative script".
"On these numbers, lots of previously marginal seats become fairly safe for Labour – Ilford North, for example, goes from a knife edge to a fairly comfortable 10 per cent majority," he said.
"That wasn’t really in the Conservative script.”
Based on the university research, next week's ballot could see former Business Secretary Vince Cable win back the Twickenham seat he lost to Conservative Tania Mathias in the 2015 election.
His fellow Lib Dem and former cabinet colleague Ed Davey would also make a speedy return to Parliament, following defeat to James Berry in neighbouring Kingston and Surbiton.
Former business secretary Vince Cable is hoping to win his seat back from Conservative Tania Mathias
Get Quotes on Home Insurance
On these numbers, lots of previously marginal seats become fairly safe for Labour. that wasn't in the Conservative script
Professor Philip Cowley
The data also points to Labour victories in Croydon Central and Hendon, where Conservatives Gavin Barwell and Matthew Offird have been installed since 2010.
However the university warned that, with the exception of Croydon Central, the seats were all marginals and should be seen as too close to call based on the polling.
Theresa May's Conservatives have lost ground in the capital according to polls
Another unknown was the impact of the Greens and UKIP not standing in certain constituencies, Prof Cowley said.
But he added: “In the end though, I doubt it will make much difference – their combined support has shrunk from 13 per cent in 2015 to around five points now.
"The combined Labour and Conservative vote share is 83 per cent, which we’ve not seen in London since 1979.
"There’s some good news for the Lib Dems, but in most seats in London this is increasingly an old-school red versus blue fight."
The TV election debate – in pictures Wed, May 31, 2017
The televised debate saw Jeremy Corbyn, Amber Rudd, Paul Nuttall, Caroline Lucas, Angus Robertson, Tim Farron and Leanne Wood go toe-to-toe
PA 1 of 15
The politicians taking part in the debate
The polls also showed Labour is preferred by 59 per cent of 18-24 voters, while the Conservatives are supported by 60 per cent of the over 65s.
The Labour Party is 21 points ahead of the Conservatives among 25-49 year olds, and 16 points ahead among 50-64 year olds.
Perhaps more surprisingly, almost the same amount of Londoners trust Jermemy Corbyn to keep Britain safe (41 per cent) as Theresa May (42 per cent).
Meanwhile just three per cent of London voters said the bombing in Manchester will change the way they vote, with 85 per cent stating that they intend to vote the same way.