Anthony Pilkington, a former United trainee, headed the only goal of the game, with Hughton particularly delighted about Norwich's resilience.
"They tested us more than anybody we have played against and were resilient enough," Sky Sports News quotes Hughton as saying.
"I suppose with the run we are on, the confidence we have from that we were able to show. It is certainly a wonderful achievement."
The result put Norwich 13th in the Premier League table.