Michaela McCollum, from Dungannon, Co Tyrone, and co-accused Melissa Reid, from Lenzie near Glasgow, were sentenced to six years and eight months by Judge Pedro Miguel Puente Bardales in what was described as a "brief process".
Judicial spokesman Daniel Vega said: "The women were very calm as the sentence was handed down at the court in the Sarita Colonia prison.
"They will now begin serving their sentence in the Santa Monica prison.
"It is still not clear whether they will be able to serve part of their sentence in the UK - the judge said that was not a decision for the court and they would have to reach an agreement with the prosecution."
More top news
People should only be allowed to move freely within the EU if they have a job waiting for them, the Home Secretary has said.
A 62-year-old woman has been found alive more than a week after she vanished while on a hiking trip.
The first African American actor to play the lead role in Les Misérables on Broadway has died, aged 21.