During his sentencing hearing Papadopoulos said his case should serve as a warning to others.
Since that time, the former campaign aide has been cooperating with investigators working with Robert Mueller on the Russian election interference probe.
Papadopoulos acknowledged that he had lied to investigators about contacts with a Kremlin-linked professor who informed him in April 2016 that the Russians had "dirt" on Hillary Clinton and "thousands of emails".
Papadopoulos has cooperated for more than a year with Mueller's probe into Russian interference in the U.S. presidential election and possible collusion with the Trump campaign.
In court on Friday, prosecutor Andrew Goldstein said Papadopoulos's cooperation "didn't come close to the standard of substantial assistance". He was also ordered to pay a fine of $9,500.
Speaking to reporters aboard Air Force One on Friday ahead of the sentencing, Trump played down his relationship with Papadopoulos.
"My entire life has been turned upside down".
Papadopoulos apologized for his actions, telling a judge that he had made a "dreadful mistake" and was eager for redemption. The judge said there's no evidence Papadopolous had "any desire to aid Russian Federation in any way". "I would have preferred less time in jail, but that's okay". That's the only thing I know about him.
The White House distanced itself from Papadopoulos, referring to his campaign role as nothing more than a low-level coffee boy, after his guilty plea.
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Breen said his client's primary interest was brokering a meeting between Trump and Putin, a move he believed the campaign supported.
Prosecutors sought a sentence of up to six months, while defence lawyers asked for probation. Van der Zwaan was sentenced to 30 days in prison.
Papadopoulos had pleaded guilty to the crime last October.
"Caught off-guard by an impromptu interrogation, Mr Papadopoulos misled investigators to save his professional aspirations and preserve a perhaps misguided loyalty to his master", the statement said. The judge who sentenced Van der Zwaan, by contrast, did not feel he was contrite about his crimes.
Trump has regularly lashed out against the sprawling probe he dubs a "witch hunt" driven by his Democratic foes.
"The president of the United States hindered this investigation more than George Papadopoulos ever could", Breen told the judge.
In hindsight, he said in court, he recognizes that was wrong and "might have harmed the investigation". Mifsud left the United States and not returned, after the Federal Bureau of Investigation found him in the US on February 11, 2017, about two weeks after Papadopoulos's first interview.
George Papadopoulos, former campaign adviser for Donald Trump, arrives for sentencing with his wife Simona Mangiante Papadopoulos. Last November, Mr Sessions testified to Congress that he had "pushed back" against Papadopoulos' offer.