Unlike previous Happier Than Ever singles, "NDA" missed top 20 on the UK Singles Chart, peaking at number 23. Elsewhere in Europe, the song peaked within top 20 of countries such as Greece, Ireland and Norway, logging at numbers 19, 13, and 16, while Lithuania is the only country where the single hit the top 10—it peaked at number 10. In Oceania, the song also was placed in top 20 of Australia and New Zealand. In the former, "NDA" appeared at number 16 on the ARIA Singles Chart, before falling off the chart after two weeks. After the album's release, the song re-entered the ARIA Singles Charts at number 36. In the latter, the single logging position 14. "NDA" was certified gold by Australian Recording Industry Association (ARIA) and Polish Society of the Phonographic Industry (ZPAV) for selling 35,000 and 25,000 copies in Australia and Poland, respectively.
