Aarons has struggled for game time in recent years at St James' Park, as a combination of injury and poor form has seen other players jump ahead of him in the pecking order.
He was a highly fancied youngester, impressing in the cup competitions including scoring against Manchester City, as well as possessing terrifying pace.
"The journey continues, very excited to be representing Slovan Liberec for the next 6 months. Can’t wait to express myself again and help the team!" Aarons posted on Twitter.
Aarons will spend the next six months in the Czech Republic, and Newcastle are yet to make any comment on the move.