It is a precautionary measure to combat the mosquito-borne Zika virus linked to thousands of birth defects in Brazil, the Guardian said.
Health officials said Zika outbreaks have been reported in at least 26 countries in the Americas. Brazil has been the nation hardest hit but outbreaks have been reported in Mexico, the Caribbean, Central America and South America.
In the United Kingdom, the majority of aircraft from those regions are already sprayed inside as a precaution against malaria, another disease transmitted by mosquitoes, the newspaper said.
The World Health Organization on Monday declared the rapidly spreading Zika virus to be a global emergency.