Tosin Femi Olasemo, 37, of Cardiff, who claimed to be an American soldier serving in Afghanistan, to defraud two women of more than £250,000 has been ordered to pay back the money.
He used a picture of a uniformed soldier as his profile photo on the dating site match.com. He was jailed in 2015 for four-and-a-half years after admitting fraud.
A confiscation hearing at Cardiff Crown Court ruled he would serve a further two-and-a-half years if he did not pay. Olasemo will be deported from the UK whenever he is released.
Following his conviction, a Proceeds of Crime Act investigation took place which revealed that Olasemo had links to Nigerian bank accounts containing more than £150,000.
He also had land purchased in Nigeria for about £47,000 and was found in possession of more than £1,100 when he was arrested.
During his sentencing in July 2015, the court heard he had tried to take more than £400,000 from lonely women using the alias Captain Morgan Travis, but banks stopped some payments going through.
At the latest court hearing, he was ordered to repay just over £200,000 to his two victims, who live in Denmark. He also has three months to arrange the sale of the land in Nigeria to repay the remaining money.