Anastasia Vashukevich, known by her pen-name Nastya Rybka, was held with several others in a police raid last February in the sleazy seaside resort of Pattaya.
In a case that veered between salacious and bizarre, Vashukevich said she had travelled to Thailand after becoming embroiled in a political scandal with Russian aluminium tycoon Oleg Deripaska -- a one-time associate of Trump's disgraced former campaign director Paul Manafort.
She then set tongues wagging by promising to reveal "missing puzzle pieces" regarding claims the Kremlin aided Trump's 2016 presidential election victory.
But the material never surfaced and critics dismissed the claims as a publicity stunt.
In the risque Pattaya seminar led by Alex Kirillov, a self-styled Russian seduction guru, some participants wore shirts that said "sex animator" -- though one person at the time described it as more of a romance and relationship course.
Vashukevich pleaded guilty alongside seven others to multiple charges, including solicitation and illegal assembly at a Pattaya court on Tuesday, which ordered the group be deported.
On Thursday afternoon, Vashukevich and the majority of the convicted were put on an Aeroflot flight for Moscow, bringing to an end the Thai side of a baffling case.
Thailand's immigration chief Surachate Hakparn said the last of the group would leave the country this evening.
It was unclear what would happen to them -- including Vashukevich -- on arrival in Moscow.
Vashukevich, who has more than 120,000 followers on Instagram and penned a book about seducing oligarchs, also faces legal problems in Russia.
Deripaska won an invasion of privacy lawsuit against her and Kirillov in July after a video apparently filmed by the model showed the tycoon vacationing with an influential Russian deputy prime minister at the time.
Both Washington and Moscow publicly shrugged off Vashukevich's story, which the US State Department described as "bizarre".