Banbury looked good for half an hour with Ravi Shamsi giving them the lead on 18 minutes.
But two goals from Nabil Shariff on 31 minutes and 38minutes gave St Neots a 2-1 half time lead.
Second half was very disappointing from the United perspective. A superb strike from Dylan Williams into top corner of the net just before the hour mark made it 3-1 and Banbury rarely looked like getting back into the game after this with it being all rather too easy for the visitors from then on.
Match report to follow