"Fearless" debuted at number 85 on South Korea's
Gaon Digital Chart in the chart issue dated May 1–7, 2022. It rose to number 12 in the chart issue dated May 22–28, 2022. On the
Billboard South Korea Songs chart, "Fearless" debuted at number 11 in the chart issue dated May 14, 2022, ascending to number four in the chart issue dated May 28, 2022. In New Zealand, the song debuted at number 27 on the
RMNZ Hot Singles in the chart issue dated May 9, 2022. In Japan, the song debuted at number nine on the
Billboard Japan Hot 100 in the chart issue dated May 11, 2022. On the
Oricon Combined Singles Chart, the song debuted at number 13 in the chart issue dated May 16, 2022. In Singapore, "Fearless" debuted at number eight on the
RIAS Top Streaming Chart in the chart issue dated May 6–12, 2022, peaking at number seven the following week. The song also debuted at number 13 on the RIAS Top Regional Chart in the chart issue dated April 29 – May 5, 2022, ascending to number four in the following week. In Malaysia, the song debuted at number 12 on the
Billboard Malaysia Songs chart in the chart issue dated May 21, 2022. It also peaked at number eight on the
RIM International Singles Streaming Chart in the chart issue dated May 13–19, 2022. In Taiwan, the song debuted at number 14 on the
Billboard Taiwan Songs chart in the chart issue dated May 21, 2022. In Indonesia, "Fearless" debuted at number 20 on the
Billboard Indonesia Songs chart in the chart issue dated May 21, 2022, ascending to number 19 in the following week. On the
Billboard Vietnam Hot 100, the song debuted at number 65 in the chart issue dated May 12, 2022, ascending to number 36 in the following week. In United States, "Fearless" debuted at number 14 on the
Billboard World Digital Song Sales chart in the chart issue dated May 14, 2022, ascending to number 12 the following week. The song debuted at number 155 on the
Billboard Global 200 and number 74 on the
Billboard Global Excl. U.S. in the chart issue dated May 14, 2022. It ascended to number 69 on the
Billboard Global 200 and number 48 on the
Billboard Global Excl. U.S. the following week. The Japanese version of "Fearless" debuted atop of the daily ranking of the
Oricon Singles Chart on its first day, selling 132,621 physical copies. It finished at number one on the weekly Oricon Singles Chart with 222,286 units sold, while
Billboard Japan recorded 321,717 sales from January 23–29, 2023. The single was later certified double platinum by the
Recording Industry Association of Japan (RIAJ) for selling over 500,000 units. ==Promotion==