Son collected half-time substitute Brennan Johnson’s clever pass before beating the Hatters goalkeeper Thomas Kaminski with a low shot, which took a deflection off Daiki Hashioka on its way in.
Tahith Chong’s well-worked goal had given the Hatters an early lead, but Spurs responded well and equalised early in the second half when Johnson’s cross was turned into his net by Issa Kabore.
Spurs laid siege to the Luton goal after restoring parity, but a series of crucial last-ditch challenges kept Ange Postecoglou’s team at bay – and Alfie Doughty somehow prevented Johnson’s close-range effort from rolling over the line.
However, there was nothing Luton could do about Son’s 15th goal of the season, which means Tottenham have come from behind to win four of their past five home league matches.
Aston Villa will reclaim fourth place with a draw at home to Wolverhampton Wanderers later on Saturday. Luton, meanwhile, drop into the relegation zone with 22 points.
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