Trevor Brooks, 40, and Simon Keeler, 44, from east London both admitted failing to inform the police of their intention to leave the UK.
They were extradited from Hungary after being found on a train headed for Bucharest, Romania, in November last year.
The sentencing judge described it as a "serious and deliberate" offence.
Justice Saunders told the duo that he did not sentence them "on the basis that the defendants were travelling in order to commit a terrorist offence or that they were preparing a terrorist offence either in this country or abroad."
The court was told that Keeler said he was attempting to travel to Turkey to visit his wife and children and Brooks had accompanied him in order to help him find them.
Restrictions had been imposed on them after they were each imprisoned for three years and six months for funding and inciting terrorism in 2008.
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