The duped women believed Captain Morgan Travis was an Afghan war hero looking for love on website Match.com.
But Captain Travis did not exist and had been invented by fraudster Tosin Femi Olasemo, 38, who was jailed in 2015 for four-and-a-half years after admitting fraud.
A confiscation hearing at Cardiff Crown Court has now ruled he will serve a further two-and-a half years if he does not pay the money back.
Olasemo will be deported when he is released.
This case has demonstrated the dangers of providing personal details and sending money to strangers online - Detective Inspector Paul Giess
In the UK on a student visa, he used a picture of a soldier wearing full military uniform as his profile picture.
He claimed he was stationed at Camp Joyce, a remote base in eastern Afghanistan.
He began "intense online relationships" with the women, before asking for money.
Prosecutor Ruth Smith said small amounts spiralled into a fortune after he "brainwashed" women into believing they were in a real relationship.
Ms Smith said: "He conducted an online dating fraud exploiting lonely and vulnerable women by pretending he was an American soldier in Afghanistan to get money."
When police searched his computer in January 2015 they found "conversations with numerous women".
They also found several false Nigerian passports and driving licences.
In July last year Judge Eleri Rees QC told him he had created a "tissue of lies".
A spokesman for South Wales Police said: "An investigation revealed that Olasemo had links to Nigerian bank accounts containing more than £150,000 and land purchased in Nigeria for around £47,000.
In addition, he was in possession of more than £1,100 when he was arrested.
"Olasemo had a benefit from his crime totalling £253,347. The court ordered that £200,707 is repaid to his two victims who reside in Denmark."
Detective Inspector Paul Giess said: "This case has demonstrated the dangers of providing personal details and sending money to strangers online.
"Fraudsters use a variety of tactics to con their victims."
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