Mainland Spain and the Balearic Islands will become designated red countries on the government's traffic light system from midnight on Thursday (20 August).
It means arrivals from these places will have to get a test at the border and undergo two weeks of self-isolation, no matter if the result is positive or negative.
The Balearic Islands only turned into an amber-classified country a week ago - with the sharp surge in cases across Majorca, Menorca, Ibiza, and Formentera continuing since then.
Following the change, CI Travel Group announced the cancellation of its direct fights to Majorca from 30 August onwards and said that services to the Costa del Sol were under review.
Countries go into the red category if there are more than 120 cases per 100,000 population.
Moldova and Iraq will also be classified red countries from Thursday. Austria and Trinidad and Tobago will go from green to amber.
Person rescued from a blaze at a flat in Jersey
Four Jersey seal pups to set sail and return to their seas
Jersey's inflation rate falls to 5.7%
Fewest babies born in Jersey since 1976
Sam Ryder to headline Battle of Flowers 2024
Corbière will stay lit for two more weeks
Jersey government reveals new plans to make schools more inclusive
Marathon-running Jersey DJ raises £12k for cancer charity
