Portugal was taken off the travel green list of countries, meaning holidaymakers returning will need to self-isolate for 10 days when returning home HOLIDAYMAKERS scrambling for flights home from Portugal before new quarantine requirements come into force are being charged hundreds of pounds. People arriving in the UK from Portugal after 4am on Tuesday will need to self-isolate at home for 10 days after the Government moved it from the green list to the amber list. A seat on a Ryanair flight from the capital Lisbon to Manchester on Monday costs £339, whereas travel on the same route is available for just £75 on Wednesday.