Castleford Tigers halfback will sign for London Broncos in 2020, the club has announced.
Aston signed for the Tigers from Sheffield Eagles, but has since struggled to hold down a regular starting position.
Despite that, he has scored three tries in nine appearances so far this season.
He is the first signing the Broncos have confirmed for next year.
Aston is not the only player departure today as Wigan bound prop Mitch Clark has been released from his contract early and has joined Championship side Leigh Centurions on a short term deal.