According to the median survey of analysts, the likelihood of a UK exit without an agreement has fallen to 20% from 30% in October, the lowest since May.
"With the lifting of the threat of non agreement exit in October, the deadline for brexit has been postponed again, and the adverse factors of brexit have disappeared. The focus is now clearly on the UK election, "said Victoria Clarke, an analyst at Investec.
Johnson has the strongest electoral support so far, with Nigel Farage's brexit party withdrawing Monday from the battle for 317 conservative seats to prevent opposition brexits from taking control of the next parliament.
This could help Johnson win a parliamentary majority in the December 12 election, allowing him to implement the results of the June 2016 referendum and lead the UK out of the EU.
A ICM poll on Monday showed that Johnson's Conservative Party had a slightly larger lead than the opposition Labour Party in the past week.
The vast majority of analysts say the UK and the EU will eventually reach a free trade agreement.
The second most likely scenario would be for the UK to remain in the European Economic Area (EEA), which would mean paying the EU budget and retaining access to the single market, but not having a say in policy.
The third option may be the more extreme one: to withdraw from Europe without agreement and trade according to the rules of the World Trade Organization (WTO). As most Reuters surveys show, the last possibility is to give up brexit.
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