"Through this exercise, the South Korean and U.S. Air Forces demonstrated their strong deterrence against North Korea's nuclear and missile threats," the South Korean Air Force said, as quoted by the media outlet.
Maj. Ryan Simpson, the Pacific Air Forces bomber operations chief, reportedly said that South Korea provided "an excellent training environment for increasing the capability of our bomber crews."
The drill was held hours after North Korea had a missile launch that may have failed.
In early March, South Korea began the deployment of the US Terminal High Altitude Area Defense (THAAD) system, which was also meant as protection against Pyongyang.
North Korea has carried out a number of missile launches and nuclear tests in the last year, which led to tensions rising on the peninsula.