Matthew and Grace Huang were stopped from exiting the conservative Gulf nation and had their passports confiscated as they tried to pass through airport immigration control in the capital, Doha, said family representative Eric Volz, who is traveling with them. The unexpected delay adds a new twist to a closely watched legal saga that may have stemmed from cultural misunderstandings in the conservative Gulf nation.
They were met at the airport by US Ambassador Dana Shell Smith, reflecting the intensity of American government interest in the case.
The Huangs spent months behind bars before being let out on their own recognizance last November. They were convicted in March of this year of child endangerment and sentenced to three years in prison. They were allowed to remain free pending their appeal.
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The Huangs have two other African-born adopted children and have been pressing Qatari officials unsuccessfully for permission to leave the country to be with them.
"It has been a long and emotional trial for me and my family, and Grace and I want to go home and be reunited with our sons," Matthew Huang said shortly after the ruling. "We have been unable to grieve our daughter."
US officials intervened on the couple's behalf by raising the case with Qatari officials on multiple occasions. State Department spokeswoman Jen Psaki last month urged Qatar to lift the Huangs' travel ban immediately and bring the case to "an expeditious and just conclusion."
Qatar also hosts an important American military air operations center near Doha that is involved in airstrikes against the Islamic State group.