Aviation Minister Hardeep Singh Puri had announced earlier this month that only 30 flights per week will operate between India and the UK between January 8 and January 23.
While it is natural for viruses to change over time and the variant is not believed to cause more severe symptoms, its "increased transmissibility", means it still raises concern, says WHO Europe.
England is facing a third national lockdown that will go on till mid-February, as authorities struggle to stem a surge in coronavirus cases that have left hospitals across UK overwhelmed.
The government's decision to allow over 500 tourists from Ukraine into the country sparked a controversy after drivers of the wild safari the tourist had been on were forced to be under quarantine.
There are 2,50,183 active coronavirus cases in the country, which accounts for 2.43 per cent of the total caseload, the data stated.
Delhi recorded 677 COVID-19 cases and 21 new fatalities on Wednesday, even as the positivity rate dropped to 0.8 per cent, authorities said.
The Indian High Commission in London said that it is on standby for any "emergency visa" requirements.
India has put in place a pro-active and preventive strategy to detect and contain the mutant variant of the virus.
South Korea halted flights to and from the UK on December 23, but it is still possible to get from the UK to South Korea via other countries.
Britain's Matt Hancock had said that the variant there was "highly concerning, because it is yet more transmissible, and it appears to have mutated further" than the similar strain in Britain.
Scotland had already closed its border with the rest of the United Kingdom before the new strain was made public.
As per Standard Operating Procedure (SOP), passengers from the UK will only be permitted to exit the airport when the report of all the passengers in the flight is out.
While 299 have been sent to various hotels for the mandatory quarantine, 292 are at the airport, a civic official said.
According to an official statement here, Chief Minister Uddhav Thackeray held a meeting in the light of the situation in the UK.
"Considering the prevailing situation in UK. Govt. of India has decided that all flights originating from UK to India to be suspended till 31st December 2020," the aviation ministry said in a tweet.