A date when fully-vaccinated travellers will be able to arrive in England from amber list locations without self-isolating is expected to be announced on Thursday.
The policy could come into effect as early as July 19, boosting demand for summer holidays to destinations such as mainland Spain, France and Italy.
Ministers will meet on Thursday to agree the policy, which will be announced by Transport Secretary Grant Shapps.
People arriving in the UK from amber locations must currently self-isolate at home for 10 days, making holidays in those locations unviable for many.
The Government confirmed last month it intended to lift the quarantine requirement for people who have had both doses of a coronavirus vaccine this summer.