Industry leaders and holidaymakers criticised the Government, saying travellers are “totally confused” by the different approaches taken in Westminster and the devolved administrations.
Wales and Scotland have added restrictions to passengers returning from the summer holiday hotspots, but the UK Government on Thursday said there would be no change to its list.
There had been speculation that Westminster would reimpose the quarantine requirement on Portugal due to a spike in Covid-19 cases.
This led many holidaymakers to pay hundreds of pounds to fly home this week, but it was later announced there would be no changes to the Government’s list.
The Government was also under pressure to reimpose quarantine rules on arrivals from Greece after Scotland and Wales introduced restrictions in recent days.
The Welsh Government then revealed that it is removing the exemption from the 14-day self-isolation requirement for travellers returning from Portugal, Gibraltar and seven Greek islands.
The new rule comes into force at 4 am on Friday.
The Scottish Government later said passengers arriving from Portugal would have to quarantine from 4 am on Saturday, as well as those arriving from French Polynesia.
Scotland began requiring travellers from anywhere in Greece to enter quarantine from Thursday.
There were 23 Covid-19 cases per 100,000 people in Portugal in the seven days to Wednesday, up from 15.3 a week earlier. Read more