The North fired an intercontinental ballistic missile believed capable of hitting the USA mainland last Wednesday.
Airlines operating routes between Korea and the United States are changing flight paths to avoid areas that may be exposed to missile launches from North Korea.
The world-renowned carrier changed the flying route of its Seoul- Los Angeles flights since last July as a safety precaution against the North Korean missile tests, stated a report in Channel NewsAsia.
An official at the Ministry of Land, Infrastructure and Transport said, "It appears that Singapore Airlines is flying over Busan and the east coast of Japan rather than flying through Gangwon Province and the East Sea".
Cathay Pacific said Monday passengers and crew on the flight from San Francisco to Hong Kong reported witnessing the flight of the Hwasong-15 ICBM.
"The safety of our customers and crew is our number one priority and we continuously monitor the areas that we overfly", the spokesperson added.
Crew Saw DPRK Missile Test on Cathay Pacific Flight from HK
The organization condemned the Pyongyang regime in October for its repeated launch of ballistic missiles.
"There are no current routes that fly through a unsafe zone", said an Asiana Airlines official.
The same missile had also prompted Air France to expand its no-fly zone around North Korea, after the airline found out the projectile may have been as close as 100km (62 miles) to one of its planes . Cathay Pacific's crew reported seeing the weapon re-enter the Earth's atmosphere, while Korean Air said its pilots "saw a flash". The chances are "billions to one", aviation safety analyst David Soucie told CNN.
On 29 November North Korea it said could reach anywhere in the US.
Katherine Lam is a breaking and trending news digital producer for Fox News.
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