A 16-year-old boy and his sister say they are "fuming" after being left stranded in Pakistan following the country's addition to the government's red list.
It comes as a headteacher in Bradford also admitted it is "a huge, huge worry" that 11 families at her school are stuck in the Asian country due to the "unaffordable" UK quarantine rules.
To get the latest email updates from LeedsLive, click here.
Rising Covid-19 rates in Pakistan prompted the Foreign, Commonwealth & Development Office (FCDO) to upgrade the country to the strictest quarantine level on April 9.
It is now one of 40 countries on the red list which require anyone returning to the UK to pay £1,750 to stay in a government-approved hotel for 10 days.
Adam Jalil and his 19-year-old sister Alishba, from Armley in Leeds, originally flew out to Pakistan in late January when their grandad fell ill, but they have been unable to return since.
"We really don't know what to do any more," said Adam, a sixth form student at Lawnswood High School.
"My sister is crying every day because we just don't know what to do. We are at my auntie's house, but we can't stay forever.
"We can't afford to come home. I have no idea when we will be able to get back."
Adam's mum and his two younger brothers flew back to the UK on April 2, but the teenager and his sister simply could not book flights due to the huge demand before the red list kicked in a week later on April 9.
"There were no flights available for me and my sister," he said.
"Everything was rammed. We tried every single day but there was just nothing available."
Not only has it left Adam and his sister effectively sofa surfing with family members during lockdown in Pakistan, but it also means the siblings are unable to support their mum at home in Leeds.
"We have been all over the place," said Adam. "All our family here have lives to get on with. We can't stay with them forever.
"My mum relies on me and my sister a lot to help out, but we are not there at the moment. She is really struggling and needs us back home."
Enter your postcode for the latest Covid-19 data for your area
Leeds West MP Rachel Reeves has attempted to raise Adam's case with the FCDO on several occasions - but has heard nothing back from the government for more than six weeks.
"It's atrocious that we are being ignored by the government," said Adam. "I'm fuming."
A government spokesperson said their main priority is "protecting the public" with a "robust border regime".
As stark as Adam's situation is, the youngster is not alone in being stuck abroad.
Bradford headteacher Lynette Clapham told LeedsLive there are 11 families at one of her schools who cannot get home from Pakistan.
"It is a huge, huge worry for us," she said.
"We haven't seen some of these children for more than 130 days, since before Christmas.
"In terms of wellbeing, safeguarding and mental health it a huge concern."
The majority of families flew abroad before the Christmas holidays, but were left struggling to return when the UK went into lockdown in early January. The escalation of Pakistan's status to the red list has made it even harder - and even more expensive - to return home.
"It has gone from bad to worse," said Lynette.
"We have had one family say they just can't afford the quarantine hotels.
"Others are looking at trying to come back via other countries.
"The priority for us is making sure the children are safe, but for our families the quarantine simply isn't affordable."
A Department of Health and Social Care spokesperson said: “Our top priority has always been protecting the public and the robust border regime we introduced is helping minimise the number of new variants being imported into the UK.
“Currently you can only travel internationally from England where you can show that such travel is essential. Anyone returning to England from a red list country needs to book and pay for their hotel quarantine package, which is a single-cost charge.
“Anyone facing significant financial hardship have the opportunity to apply for a deferred repayment plan when booking.”
