Dozens of countries will be exempt from a travel quarantine from Monday, UK government sources have indicated.
Currently, most people arriving into the UK from anywhere apart from the Republic of Ireland have to self-isolate for two weeks.
Ministers had previously indicated they were working to establish a relatively small number of travel corridors.
Travel and tourism companies have been calling for urgent clarity over the corridors amid rising bookings.
Last weekend, the government said it would relax its advice on travel abroad and would rate countries as either green, amber or red, depending on the prevalence of the virus.