Ballantyne made his first team debut against Partick Thistle in a Scottish Premiership match on 10 May 2016.[3] He joined League Two team Montrose on loan in August 2016,[4] with the loan being extended in January 2017 for the rest of the 2016–17 season.[5] In March 2017, Ballantyne extended his Dundee United contract to 2018.[6] He rejoined Montrose on a season-long loan in August 2017.[7] His spell with Montrose was, however, cut short, and he was recalled at the start of January 2018.[8] He then rejoined Montrose on an emergency loan for the remainder of the season in March 2018.[9] Following the end of his contract, he was released by United in May 2018[10] and joined Scottish League One side Dumbarton in June 2018.[11] After making 32 appearances for Dumbarton, he joined Montrose on a two year permanent deal in May 2019.[12]
In May 2022 Ballantyne signed for Airdrieonians, where he ended up getting him and the club promoted to the Scottish Championship, beating Hamilton Accies on penalties, with Ballantyne himself scoring Airdries' sixth.
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