Swindon Town condemned Chesterfield to a third consecutive defeat when they visited the Proact Stadium in October.
Jimmy Ryan, Eoin Doyle and Sam Morsy all went close early on for the Spireites before the visitors struck twice in five minutes.
A stunning free-kick from Yaser Kasim broke the deadlock before the impressive Nathan Byrne doubled the Robins’ first half lead.
Andy Williams tapped in to complete the scoring for Swindon in the second half as the rain poured down in north Derbyshire.
Oscar Gobern started for Chesterfield in one of only three appearances for the club in his brief loan spell from Huddersfield Town.