Syrian media quoted local sources as saying that the militants had been relocated from the town of al-Shaafah near the Iraqi border to an unknown location on Saturday night.
It was not the first airlifting of terrorists by the US in Syria as there has already been numerous reports of such transfers.
The evacuation comes amid fresh sweeping advances by Syrian army soldiers and allied fighters against the Takfiris on the battlefield.
In recent months, Daesh has been driven out of much of the territory under its control.
Latest reports say there has been clashes between Daesh elements and the so-called Syrian Democratic Forces (SDF), a US-backed coalition of mainly Kurdish militants, around the Deir ez-Zor city of Hajin.
The skirmishes have left a number of people dead and injured on both sides.
Last September, Syrian government forces managed to enter Deir ez-Zor city, breaking an Daesh siege of nearly three years on government-held parts of the provincial capital.
Two months later, the Syrian military announced that it had fully liberated the Deir ez-Zor city of Bukamal, Daesh's last urban stronghold in the country.
Now, Daesh controls small pockets of Deir ez-Zor Province, much of them empty desert.
The Syrian army currently prepares for ridding the northwestern Idlib Province of several foreign-backed militant groups.
Source: Press TV