North Korea is also facing strong sanctions from the US and firm condemnation from the global community in the wake of repeated missile launches and nuclear tests.
The Air Force said Tuesday's overflight demonstrated how US military forces "are always ready to defend the American homeland and how the USA stands resolutely with Japan and [South Korea] to honor their unshakeable alliance commitments to safeguard security and stability".
South Korean analysts say the nighttime flights, and also the decisions by Washington and Seoul to release the itinerary of the warplanes, are aimed at sending a clear warning to North Korea and demonstrating capability for surprise attacks.
The United States, meanwhile, staged another show of force meant to deter any North Korean aggression by flying two B-1B supersonic bombers Tuesday night from an air base in the USA territory of Guam to the South for drills with South Korean fighter jets.
The statement by South Korea's Joint Chiefs of Staff also revealed that the two bombers carried out air-to-ground missile drills in waters off the east coast of South Korea, then flew over the South to waters between it and China to repeat the drill.
The bombers took off from the US Pacific territory of Guam, before entering South Korean airspace and conducting firing exercises over the East Sea and Yellow Sea, South Korea's military said.
Former Chelsea defender Ricardo Carvalho sentenced to 7 months in jail
Carvalho played for Real between 2010 and 2013 under Jose Mourinho, with the offences having taken place between 2011 and 2012. Reports have stated that the Portuguese defender has been charged for tax fraud from his time playing for Real Madrid .
Meanwhile, US President Donald Trump met top officials from his National Security team on Tuesday night for a briefing on ways to respond to threats from North Korea, the White House said.
North Korea hackers have reportedly stolen a large number of military wars documents from South Korea, including a plan to assassinate the country's dictator, Kim Jong-un.
The exercise showed the "strong ability of the alliance against the North Korean nuclear missile threat", the South Korean air force said.
Russia's TASS news agency quoted North Korean Foreign Minister Ri Yong Ho as saying: "With his bellicose and insane statement at the United Nations, Trump, you can say, has lit the wick of a war against us".
While the attention Wednesday was on air power, upcoming US-South Korea naval exercises could further aggravate tensions.
Separately, the Navy said a US submarine that is capable of firing Tomahawk cruise missiles and torpedoes made a port call Saturday at the USA base in the South Korean city of Chinhae. North Korean hackers were the prime suspects in the attack, the impact of which may have been exaggerated for propaganda purposes.