The step was taken on humanitarian grounds, said Union Health Ministry Joint Secretary Lav Agarwal in a letter to the Ministry of External Affairs Joint Secretary G Balasubramanian.
The guidelines also stated that two percent of the total flight passengers should undergo post-arrival testing randomly on arrival at the airport.
The civil aviation ministry said that the Air-Suvidha portal is being modified to facilitate mandatory pre-booking for RT-PCR tests for those arriving from these countries.
Omicron scare: Self-declaration must for international flyers as more test COVID positive upon arrival
Civil aviation minister Jyotiraditya Scindia on Tuesday took stock of preparedness, testing capacities and the situation on the ground with regard to crowd management at all airports.