Group members RM, Jin, Suga, J-Hope, Jimin, V and Jungkook sang and danced to their hit outside on a set featuring an amusement park, gas station, a restaurant and a theater, complete with fireworks.
The episode was the second of the semi-finals results shows, and will move five acts into the Top 10.
"Dynamite" has spent two weeks atop the Billboard Hot 100.
BTS' "Break the Silence: the Movie," an upcoming concert film that documents last year's "Love Yourself: Speak Yourself" world tour, is set to premiere on September 24.
In 2018 BTS performed "Idol" on the "America's Got Talent" stage.
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