Mrs Zaghari-Ratcliffe was taking daughter Gabriella to see family when she was arrested and sentenced to five years jail, spending four years in Evin Prison and one under house arrest.
Nazanin Zaghari-Ratcliffe has landed back in the UK six years after being arrested in Iran.
Her flight, that also carried Anoosheh Ashoori, touched down at RAF Brize Norton in Oxfordshire shortly after 1am on Thursday morning.
Mrs Zaghari-Ratcliffe departed the plane first, followed by Mr Ashoori, before the pair walked down the steps away from the aircraft together.
The British-Iranian mother waved at cameras as she walked into a reception building at the Oxfordshire airport, while Mr Ashoori, who was carrying a magazine, gave a salute.
Mrs Zaghari-Ratcliffe will be reunited with her husband Richard Ratcliffe and daughter Gabriella, who will welcome her home inside a reception building at the airport.
The British-Iranian mum-of-one was accused of plotting to overthrow the Iranian government, which she denied.
The family’s lawyer Hojjat Kermani said she had been freed alongside Anoosheh Ashoori, following talks between London and Tehran over a £400million debt between the UK and Iranian governments.
A source close to their families has now claimed Nazanin Zaghari-Ratcliffe and fellow detainee Anoosheh Ashoori had left Iran this morning.
Mrs Zaghari-Ratcliffe was taking the couple’s daughter Gabriella to see her family when she was arrested and sentenced to five years in jail, spending four years in Evin Prison and one under house arrest.
Nazanin told independent investigators she was threatened with execution and the torture of her family.
She also said she was chained and blindfolded in prison – and suffered sensory and sleep deprivation.
And she said she was interrogated for nine hours at a time in solitary and bombarded with bright lights and blaring TVs.
Her husband Richard says Nazanin, who spent a week in a psychiatric hospital chained to the bed in 2018, was even left suicidal.