A Co Antrim couple due to fly out to Spain yesterday had to cancel their holiday at the 11th hour after the country was removed from the quarantine exemption list at short notice.
Cathy Brown and her husband Craig had arranged a two-week break at a relative's villa after an earlier holiday to Greece in June was cancelled due to the global pandemic.
However, they were forced to cancel their replacement holiday after finding out yesterday morning that their travel insurance was void in light of the new guidance.
Cathy, from Lisburn, said: "We were supposed to be staying at a villa quite a bit outside Marbella. We thought it would be safe because it was so far away from everything. We were supposed to be going with our two foster children and we only told them on Wednesday night because we didn't want them to be disappointed. They were counting down the sleeps, so I'm devastated for them.
"We were thinking of going anyway because the flights are going ahead, but then we found out our insurance is no longer valid, so that was the decision made for us."
Davy McNeice is due to fly from Dublin Airport to Murcia International with his family for a 10-day holiday on August 13. The Banbridge family own a villa in the south eastern Spanish region and have already cancelled two other trips due to Covid-19.
He said: "Most insurance companies won't cover you if you go out and if something happens to you, and I'm not even talking about Covid-19-related. If you fell and broke your leg, apparently the insurance won't cover you because the Foreign and Commonwealth Office have said you shouldn't be going to Spain unless it's essential travel. Going on holiday isn't essential travel. It's up in the air.
"That's one thing that could stop us going.
"You don't go out thinking something is going to happen to you but that could be the one time something does."
Meanwhile, Jacky Adair from Cultra was planning on flying from Belfast to Palma de Mallorca Airport on Friday.
"I am a property owner there and obviously I haven't been able to get out and check on my house to make sure everything is still okay," she explained.
"I regard that as essential travel but I know the Northern Ireland Assembly might not regard it as essential travel, so I'm in a bit of a quandary. I don't know whether to cancel my trip or what to do.
"It seems to me that Northern Ireland has just heard that Spain is in quarantine so let's just quarantine everything without perhaps thinking or investigating should the islands be exempt."
Spain has reported more than 900 new daily infections for the last two days. (PA)
Brian Wilson from Moira is currently in the Spanish town of Fuengirola with his family and friends and when he first heard the news of the quarantine rules, he thought it was a joke.
He expected to be given at least 24 hours' notice to travel home.
"I'm here with my wife, our 15-year-old daughter, my mate, his wife and their wee girl," he said.
"We've been here for 10 days. I have an apartment out here and we haven't been out from February so we had to come out to check it and make sure everything was all right.
"I normally go out and visit customers in Northern Ireland and the UK so I'll not be able to go to any of them.
"It's not the end of the world and I can work from home, but there's only so much you can do remotely."
Ingrid Lopez is originally from Barcelona and has lived in North Belfast for the last 10 years. She travelled to see her family in Barcelona for the first time since Christmas and has been there for a week.
She said: "It's quite frustrating to find out that when I go back I have to quarantine. I obviously understand the Government's perspective and this is an extreme and difficult situation, but at the same time there's been no notice."