Swindon were relegated to League Two after suffering a 3-1 defeat at Sheffield Wednesday.
Neil Mellor scored twice to take his tally for the season to 19 with Darren Potter also on target for the home side. Jonathan Douglas was on the scoresheet for Swindon.
Potter gave Wednesday a 16th-minute lead with a deflected shot from just outside the area.
Swindon threatened to make an almost immediate response when Matt Ritchie was through on goal but Nicky Weaver got down bravely at the striker's feet to block.
Mellor put the home side further ahead with a looping header over goalkeeper Phil Smith after meeting a deep cross from John Otsemobor.
After Weaver did well to keep out a close-range shot from Elliot Benyon, Douglas pulled a goal back for Swindon with a superb 30-yard drive.
Wednesday restored their two-goal advantage in the 53rd minute when Gary Madine squared to Mellor who fired past Smith from close-range.
As Swindon pressed in the closing stages, Michael Rose put a free-kick on target which was comfortably saved by Weaver and David Prutton's shot was deflected wide.
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