Labour has secured its biggest lead in the polls since Liz Truss was prime minister, sitting 30 points ahead of the Conservative Party.
This is Sunak's worst position in the polls since he became Prime Minister in 2021.
The polling, conducted by YouGov, put the Tories on 18 per cent, while Labour was up at 48 per cent.
Reform UK was on 13 per cent, the survey showed.
Labour has secured its biggest lead in the polls since Liz Truss was prime minister, sitting 30 points ahead of the Conservative Party
PA
The polling, commissioned by the Times, comes just a week after the Tories suffered bruising results at last week's local elections.
The party lost more than 450 council seats of the 1,000 they were defending across England.
The Labour Party won contests in newly created mayoralties in York and North Yorkshire, the East Midlands and the North East, as well as ousting Tory West Midlands Mayor Andy Street.
It also gained nine police and crime commissioner posts from the Tories, including in Cumbria, Avon and Somerset, and Norfolk.
Sunak claimed the outcome of the local elections mean the Tory party is heading for a hung parliament.
He said: "These results suggest we are heading for a hung parliament with Labour as the largest party.
"Keir Starmer propped up in Downing Street by the SNP, Liberal Democrats and the Greens would be a disaster for Britain.
"The country doesn't need more political horse-trading, but action. We are the only party that has a plan to deliver on the priorities of the people."
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The Labour Party won contests in newly created mayoralties in York and North Yorkshire, the East Midlands and the North East, as well as ousting Tory West Midlands Mayor Andy Street.
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His comments were based on analysis from elections analyst Michael Thrasher who claimed that the local election results, if replicated at a general election, suggest Labour would be 32 seats short of a majority.
The polling, conducted between May 3 and May 7, spoke to 2,072 people.
