Elphicke, 49, the former MP for Dover, was convicted of groping the women in similar situations, nine years apart.
He denied the charges, but was found guilty of one count of sexual assault in 2007 and two further counts in 2016, after a trial at Southwark Crown Court.
The judge told Elphicke he was a "sexual predator who used your success and respectability as a cover".
Within minutes of his jailing, Elphicke confirmed he would appeal against his conviction, arguing he had not had a "fair trial".
Mrs Justice Whipple said Elphicke's denials had left his victims faced with the ordeal of giving evidence in court.
"They told the truth, and you told a pack of lies - not only to the jury, but your wife, the whips and the police," she told him during the sentencing hearing.
Despite the fact the defendant's wife Natalie - the current Dover MP - ended their marriage when he was convicted in July, she agreed he had not had a fair trial and confirmed she would support his appeal.
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https://www.bbc.co.uk/news/uk-england-kent-54161766